{"id":5533,"date":"2025-12-24T17:18:16","date_gmt":"2025-12-24T08:18:16","guid":{"rendered":"https:\/\/math-travel.com\/?p=5533"},"modified":"2026-02-11T16:05:36","modified_gmt":"2026-02-11T07:05:36","slug":"nizi-saidai","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-1\/nizi-saidai\/","title":{"rendered":"2\u6b21\u95a2\u6570\u306e\u6700\u5927\u30fb\u6700\u5c0f\u306e\u6c42\u3081\u65b9\uff1a\u7bc4\u56f2\u30fb\u8ef8\u306e\u5834\u5408\u5206\u30514\u30d1\u30bf\u30fc\u30f3\u3092\u5b8c\u74a7\u30de\u30b9\u30bf\u30fc"},"content":{"rendered":"\n<p><span class=\"checkmark2 on-color\">\u6570\u5b66\u2160\u4e8c\u6b21\u95a2\u6570\u306e\u4e2d\u3067\u3082\u300c<span class=\"hutoaka\">\u4e8c\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/span>\u300d\u3092\u6c42\u3081\u308b\u554f\u984c\u306f\u96e3\u3057\u3044\u3067\u3059\u3088\u306d\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4eca\u56de\u89e3\u6c7a\u3059\u308b\u60a9\u307f<\/span><\/div><div class=\"cap_box_content\">\n<p>\u300c2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3063\u3066\u3069\u3046\u3084\u3063\u3066\u6c42\u3081\u308b\u306e\uff1f\u300d <\/p>\n\n\n\n<p>\u300c\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u554f\u984c\u304c\u82e6\u624b\u3067&#8230;\u300d<\/p>\n<\/div><\/div>\n\n\n\n<p>\u4eca\u56de\u306f2\u6b21\u95a2\u6570\u306e\u4e2d\u3067\u3082\u300c\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u300d\u306b\u95a2\u3059\u308b\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi1-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30b7\u30fc\u30bf<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u554f\u984c\u306b\u306f\u5927\u304d\u304f4\u3064\u306e\u30bf\u30a4\u30d7\u304c\u3042\u308b\u3088<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p><span class=\"red-hoso\">\u300c\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3092\u6c42\u3081\u308b\u554f\u984c\u306f\u96e3\u3057\u3044&#8230;\u300d<\/span><\/p>\n\n\n\n<p>\u305d\u3093\u306a\u98a8\u306b\u611f\u3058\u3066\u3044\u308b\u65b9\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u5b89\u5fc3\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n\n\n\n<p><span class=\"huto\">\u5b9f\u306f\u3001\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u554f\u984c\u306f\u5927\u304d\u304f4\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<\/span><\/p>\n\n\n\n<div class=\"wp-block-group is-style-bg_stripe\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<ol class=\"wp-block-list\">\n<li>\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n\n\n\n<li>\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<p>\u203b\u8a73\u7d30\u306f\u4e0b\u306e\u76ee\u6b21\u304b\u3089\u30b8\u30e3\u30f3\u30d7\u3057\u3066\u306d\uff01<\/p>\n<\/div><\/div>\n\n\n\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001<span class=\"hutoaka\">2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u89e3\u304d\u65b9\u3092\u30bf\u30a4\u30d7\u5225\u306b\u89e3\u8aac<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u81ea\u5206\u306e\u82e6\u624b\u306a\u554f\u984c\u30bf\u30a4\u30d7\u306e\u554f\u984c\u3092\u63a2\u3057\u3066\u3001\u305c\u3072\u89e3\u304d\u65b9\u3092\u5b66\u3093\u3067\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kakikata\">\u300a\u5fa9\u7fd2\u300b2\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b9<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"375\" height=\"266\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/05\/\u4e8c\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b93.png\" alt=\"2\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b9\" class=\"wp-image-5463\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/05\/\u4e8c\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b93.png 375w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/05\/\u4e8c\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b93-300x213.png 300w\" sizes=\"(max-width: 375px) 100vw, 375px\" \/><\/figure>\n<\/div>\n\n\n<p>2\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306f\u4ee5\u4e0b\u306e\u624b\u9806\u3067\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u30b0\u30e9\u30d5\u3092\u66f8\u304f\u624b\u9806<\/span><\/div><div class=\"cap_box_content\">\n<ol class=\"wp-block-list\">\n<li>\u8ef8\u30fb\u9802\u70b9\u3092\u6c42\u3081\u308b<\/li>\n\n\n\n<li>y\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u6c42\u3081\u308b<\/li>\n\n\n\n<li>\u9802\u70b9\u3068y\u8ef8\u306b\u4ea4\u70b9\u3092\u6ed1\u3089\u304b\u306b\u7d50\u3076<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>2\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b9\u3092\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u304b\u3089\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br>\u21d22\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306e\u66f8\u304d\u65b9\u30923\u30b9\u30c6\u30c3\u30d7\u3067\u89e3\u8aac\uff01<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi1-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30b7\u30fc\u30bf<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u30b0\u30e9\u30d5\u304c\u66f8\u3051\u306a\u3044\u3068\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u304c\u30a4\u30e1\u30fc\u30b8\u3067\u304d\u306a\u3044\u3088<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"500\" height=\"457\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235.png\" alt=\"2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\" class=\"wp-image-7257\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235.png 500w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235-300x274.png 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p>2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u306e\u6c42\u3081\u65b9\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><span class=\"huto\">\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u306e\u554f\u984c\u306f\u5927\u304d\u304f\u5206\u3051\u30664\u3064\u306e\u30bf\u30a4\u30d7\u304c\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e4\u3064\u306e\u30bf\u30a4\u30d7<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n\n\n\n<li>\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u305d\u308c\u305e\u308c\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u6c42\u3081\u65b9\u304c\u7570\u306a\u308b\u306e\u3067\u30011\u3064\u305a\u3064\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1\">\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408<\/h3>\n\n\n\n<p>\u307e\u305a\u306f<span class=\"yellow-hoso\">\u7bc4\u56f2(\u5b9a\u7fa9\u57df)\u306e\u306a\u30442\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/span>\u304b\u3089\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408\u3068\u3044\u3046\u306e\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408<\/span><\/div><div class=\"cap_box_content\">\n<p>\u6b21\u306e2\u6b21\u95a2\u6570\u306b\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u304c\u3042\u308c\u3070\u6c42\u3081\u3088\u3046\u3002<\/p>\n\n\n\n<p>\\(y=x^{2}-4x+3\\)<\/p>\n\n\n\n<p>\\(y=-2x^{2}-4x\\)<\/p>\n<\/div><\/div>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi5-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u898b\u305f\u3053\u3068\u3042\u308b\u3051\u3069\u89e3\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u2026<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi1-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30b7\u30fc\u30bf<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u3053\u308c\u306f\u57fa\u672c\u554f\u984c\u306a\u306e\u3067\u5fc5\u305a\u89e3\u3051\u308b\u3088\u3046\u306b\u3057\u3088\u3046\uff01<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h4 class=\"wp-block-heading\">\\(y=x^{2}-4x+3\\)\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/h4>\n\n\n\n<p>\u307e\u305a\u306f\u5e73\u65b9\u5b8c\u6210\u3092\u3057\u3066\u30b0\u30e9\u30d5\u306e\u8ef8\u3068\u9802\u70b9\u3092\u6c42\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;x^{2}-4x+3\\\\<br>&amp;=&amp;(x-2)^{2}-1<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u306e\u95a2\u6570\u306f\u30b0\u30e9\u30d5\u306b\u3059\u308b\u3068\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"434\" height=\"262\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54081.png\" alt=\"\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54081\" class=\"wp-image-5552\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54081.png 434w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54081-300x181.png 300w\" sizes=\"(max-width: 434px) 100vw, 434px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3088\u3063\u3066\u3001\\(y\\)\u306f\\(x=2\\)\u3067\u6700\u5c0f\u5024-1\u3092\u3068\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u30b0\u30e9\u30d5\u306f\u305a\u3063\u3068\u4e0a\u65b9\u5411\u306b\u4f38\u3073\u3066\u3057\u307e\u3046\u306e\u3067\u6700\u5927\u5024\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u57df\u3082\u6587\u5b57\u3082\u542b\u307e\u306a\u3044\u30d1\u30bf\u30fc\u30f3\u306f\u30012\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u304c\u66f8\u3051\u308c\u3070\u7c21\u5358\u306b\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(y=-2x^{2}-4x\\)\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/h4>\n\n\n\n<p>\u554f\u984c2\u3082\u8003\u3048\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u306e\u5f0f\u3092\u5909\u5f62\u3059\u308b\u3068<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;-2x^{2}-4x\\\\<br>&amp;=&amp;-2(x+1)^{2}+2<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u306e\u95a2\u6570\u306f\u30b0\u30e9\u30d5\u306b\u3059\u308b\u3068\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"372\" height=\"246\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54082.png\" alt=\"\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54082\" class=\"wp-image-5553\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54082.png 372w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u306a\u3044\u5834\u54082-300x198.png 300w\" sizes=\"(max-width: 372px) 100vw, 372px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3088\u3063\u3066\u3001\\(y\\)\u306f\\(x=-1\\)\u3067\u6700\u5927\u50242\u3092\u3068\u308a\u3001\u30b0\u30e9\u30d5\u306f\u6c38\u9060\u306b\u4e0b\u65b9\u5411\u306b\u4f38\u3073\u3066\u3044\u304f\u306e\u3067\u6700\u5c0f\u5024\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u306e2\u554f\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u57df\u304c\u306a\u3044\u5834\u5408\u306f\u3001<span class=\"hutoaka\">&#8220;\u30b0\u30e9\u30d5\u304c\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3092\u6301\u305f\u306a\u3044&#8221;<\/span>\u3053\u3068\u3082\u3042\u308b\u306e\u3067\u6ce8\u610f\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi6-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u6700\u5927\u5024\u3084\u6700\u5c0f\u5024\u304c\u306a\u3044\u3053\u3068\u3082\u3042\u308b\u3093\u3067\u3059\u306d<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"2\">\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408<\/h3>\n\n\n\n<p>\u6b21\u306f\u5b9a\u7fa9\u57df\u304c\u4e0e\u3048\u3089\u308c\u3066\u3044\u308b\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(y=x^{2}-4x+1\u3000(0\u2266x\u22663)\\)<\/p>\n\n\n\n<p>\\(y=-2x^{2}+4x+3\u3000(-1\u2266x\u22660)\\)<\/p>\n<\/div><\/div>\n\n\n\n<p>\u3067\u306f\u3001\u3053\u306e2\u554f\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(y=x^{2}-4x+1\u3000(0\u2266x\u22663)\\)\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/h4>\n\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u3066\u3001<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;x^{2}-4x+1\\\\<br>&amp;=&amp;(x-2)^{2}-3<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u3053\u3067\\(0\u2266x\u22663\\)\u306a\u306e\u3067\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u5b9f\u8df5\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"416\" height=\"262\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54081.png\" alt=\"\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54081\" class=\"wp-image-5550\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54081.png 416w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54081-300x189.png 300w\" sizes=\"(max-width: 416px) 100vw, 416px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u30b0\u30e9\u30d5\u306e\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5927\u306a\u306e\u306f\\(x=0\\)\u306e\u3068\u304d\u306e\\(y=1\\)<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5c0f\u306a\u306e\u304c\\(x=2\\)\u306e\u3068\u304d\u306e\\(y=-3\\)\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024-1<br>\\(x=2\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(y=-2x^{2}+4x+3\u3000(-1\u2266x\u22660)\\)\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024<\/h4>\n\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u3066\u3001<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;-2x^{2}+4x+3\\\\<br>&amp;=&amp;-2(x-1)^{2}+5<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u3053\u3067\\(-1\u2266x\u22660\\)\u306a\u306e\u3067\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u5b9f\u8df5\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"404\" height=\"275\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54082.png\" alt=\"\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54082\" class=\"wp-image-5551\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54082.png 404w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306e\u3042\u308b\u5834\u54082-300x204.png 300w\" sizes=\"(max-width: 404px) 100vw, 404px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u30b0\u30e9\u30d5\u306e\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5927\u306a\u306e\u306f\\(x=0\\)\u306e\u3068\u304d\u306e\\(y=3\\)<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5c0f\u306a\u306e\u304c\\(x=-1\\)\u306e\u3068\u304d\u306e\\(y=-3\\)\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243<br>\\(x=-1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<p>\u5b9a\u7fa9\u57df\u304c\u5b9a\u307e\u3063\u3066\u3044\u308b\u5834\u5408\u3082\u30012\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308c\u3070\u7c21\u5358\u306b\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3\">\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/h3>\n\n\n\n<p>\u7bc4\u56f2(\u5b9a\u7fa9\u57df)\u306b\u6587\u5b57\u3092\u542b\u3080\u3068\u3044\u3046\u306e\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(y=x^{2}-2x+3\u3000(0\u2266x\u2266a)\\)<\/p>\n<\/div><\/div>\n\n\n\n<p>\u898b\u305f\u3068\u3053\u308d\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408\u3068\u540c\u3058\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u3088\u304f\u898b\u308b\u3068\u7bc4\u56f2\u306b\u6587\u5b57\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u5834\u5408\u3001<span class=\"hutoaka\">\\(a\\)\u306e\u5024\u306b\u3088\u3063\u3066\u7bc4\u56f2\u304c\u5909\u5316\u3059\u308b\u305f\u3081\u5834\u5408\u5206\u3051\u304c\u5fc5\u8981\u3067\u3059\u3002<\/span><\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi5-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u5834\u5408\u5206\u3051\u82e6\u624b\u3060\u3001\u3001\u3067\u304d\u308b\u304b\u306a<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi1-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30b7\u30fc\u30bf<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u5927\u4e08\u592b\u3060\u3088\uff01\u56f3\u4f7f\u3063\u3066\u4e01\u5be7\u306b\u89e3\u8aac\u3059\u308b\u304b\u3089\u3058\u3063\u304f\u308a\u8aad\u3093\u3067\u898b\u3066\uff01<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;x^{2}-2x+3\\\\<br>&amp;=&amp;(x-1)^{2}+2<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u3067\u306f\\(x\\)\u306e\u5b9a\u7fa9\u57df\u304c\\(0\u2266x\u2266a\\)\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\\(a\\)\u306e\u5024\u3092\u4ee5\u4e0b\u306e4\u3064\u306b\u5834\u5408\u5206\u3051\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\uff14\u3064\u306e\u5834\u5408\u5206\u3051<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(a&lt;1\\)\u306e\u3068\u304d<\/li>\n\n\n\n<li>\\(1\u2266a&lt;2\\)\u306e\u3068\u304d<\/li>\n\n\n\n<li>\\(a=2\\)\u306e\u3068\u304d<\/li>\n\n\n\n<li>\\(2&lt;a\\)\u306e\u3068\u304d<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u3053\u3053\u304b\u3089\u304b\u306a\u308a\u8907\u96d1\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u96e3\u3057\u305d\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u843d\u3061\u7740\u3044\u3066\u8aad\u3081\u3070\u304d\u3063\u3068\u7406\u89e3\u3067\u304d\u308b\u306e\u3067\u3001\u3086\u3063\u304f\u308a\u8aad\u3093\u3067\u307f\u3066\u4e0b\u3055\u3044\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(a&lt;1\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(a&lt;1\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"443\" height=\"247\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408.png\" alt=\"\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408\" class=\"wp-image-5546\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408.png 443w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408-300x167.png 300w\" sizes=\"(max-width: 443px) 100vw, 443px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(a&lt;1\\)\u306e\u3068\u304d\u3001\\(y=(x-1)^{2}+2\\)\u306e\u8ef8\u306f\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(a&lt;1\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243<br>\\(x=a\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(a^{2}-2a+3\\)<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(1\u2266a&lt;2\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(1\u2266a&lt;2\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"449\" height=\"262\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081.png\" alt=\"\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081\" class=\"wp-image-5547\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081.png 449w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081-300x175.png 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(1\u2266a&lt;2\\)\u306e\u3068\u304d\u3001\\(y=(x-1)^{2}+2\\)\u306e\u8ef8\u304c\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u306a\u306e\u3067\u9802\u70b9\u304c\u6700\u5c0f\u5024\u306b\u306a\u308b\u3053\u3068\u304c\u56f3\u304b\u3089\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(1\u2266a&lt;2\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243<br>\\(x=1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(a=2\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(a=2\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"437\" height=\"259\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082.png\" alt=\"\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082\" class=\"wp-image-5548\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082.png 437w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082-300x178.png 300w\" sizes=\"(max-width: 437px) 100vw, 437px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(a=2\\)\u306e\u3068\u304d\u3001\u56f3\u304b\u3089\u5206\u304b\u308b\u3088\u3046\u306b<span class=\"st-aka\">\u6700\u5927\u5024\u3092\u3068\u308b\u70b9\u304c2\u3064\u5b58\u5728\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(a=2\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0,2\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243<br>\\(x=1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(2&lt;a\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(2&lt;a\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"425\" height=\"257\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54084.png\" alt=\"\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54084\" class=\"wp-image-5549\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54084.png 425w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54084-300x181.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(2&lt;a\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306e\u53f3\u7aef\u304c\u6700\u5927\u5024\u3092\u3068\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(2&lt;a\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=a\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\\(a^{2}-2a+3\\)<br>\\(x=1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u6c42\u3081\u308b\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u89e3\u7b54<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(a&lt;1\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243\u3001\u6700\u5c0f\u5024\\(a^{2}-2a+3\\)<\/p>\n\n\n\n<p>\\(1\u2266a&lt;2\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<p>\\(a=2\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50243\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<p>\\(2&lt;a\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\\(a^{2}-2a+3\\)\u3001\u6700\u5c0f\u50242<\/p>\n<\/div><\/div>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u3001\\(a\\)\u306e\u5024\u306b\u3088\u3063\u3066\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u304c\u5909\u308f\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6587\u5b57\u3067\u306f\u5206\u304b\u308a\u3065\u3089\u3044\u65b9\u3082\u3044\u308b\u3068\u601d\u3046\u306e\u3067\u3001\u5206\u304b\u308a\u3084\u3059\u3044\u52d5\u753b\u3082\u8cbc\u3063\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u53c2\u8003<\/span><\/div><div class=\"cap_box_content\">\n<p>\uff12\u6b21\u95a2\u6570\u306e\u6700\u5927\u30fb\u6700\u5c0f\u2464\u3000\u30fb\u3000\u52d5\u304f\u5b9a\u7fa9\u57df\u7de8\u2460<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"\u3010\u9ad8\u6821\u6570\u5b66\u3011\u3000\u3000\u6570\u2160\uff0d\uff14\uff16\u3000\u3000\uff12\u6b21\u95a2\u6570\u306e\u6700\u5927\u30fb\u6700\u5c0f\u2464\u3000\u30fb\u3000\u52d5\u304f\u5b9a\u7fa9\u57df\u7de8\u2460\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/iQodRSKvv3k?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4\">\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/h3>\n\n\n\n<p>\u6700\u5f8c\u306f\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408\u3067\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u304c\u51fa\u984c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(a\\)\u306f\u5b9a\u6570\u3068\u3059\u308b\u3002\u95a2\u6570\\(y=2x^{2}-4ax(0\u2266x\u22661)\\)\u306e\u6700\u5c0f\u5024\u3092\u3001\u6b21\u306e\u5404\u5834\u5408\u306b\u3064\u3044\u3066\u3001\u305d\u308c\u305e\u308c\u6c42\u3081\u3088\u3046\u3002<\/p>\n\n\n\n<p>(1)\u3000\\(a&lt;0\\)<br>(2)\u3000\\(0\u2266a\u22661\\)<br>(3)\u3000\\(1&lt;a\\)<\/p>\n<\/div><\/div>\n\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;2x^{2}-4ax\\\\<br>&amp;=&amp;2(x^{2}-2ax)\\\\<br>&amp;=&amp;2(x-a)^{2}-2a^{2}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u3053\u3067\\(a\\)\u306e\u5024\u306b\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e3\u554f\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>(1)\u3000\\(a&lt;0\\)<br>(2)\u3000\\(0\u2266a\u22661\\)<br>(3)\u3000\\(1&lt;a\\)<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(a&lt;0\\)\u306e\u5834\u5408<\/h4>\n\n\n\n<p>\\(a&lt;0\\)\u306e\u3068\u304d\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"439\" height=\"239\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408-1.png\" alt=\"\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408\" class=\"wp-image-5568\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408-1.png 439w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408-1-300x163.png 300w\" sizes=\"(max-width: 439px) 100vw, 439px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(a&lt;0\\)\u306e\u3068\u304d\u3001\\(x=0\\)\u3067\u6700\u5c0f\u5024\u3092\u3068\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u6700\u5c0f\u5024\u306f\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50240<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(0\u2266a\u22661\\)\u306e\u5834\u5408<\/h4>\n\n\n\n<p>\\(0\u2266a\u22661\\)\u306e\u3068\u304d\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"421\" height=\"244\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081-1.png\" alt=\"\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081\" class=\"wp-image-5569\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081-1.png 421w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54081-1-300x174.png 300w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(0\u2266a\u22661\\)\u306e\u3068\u304d\u3001\\(x=a\\)\u3067\u6700\u5c0f\u5024\u3092\u3068\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u6700\u5c0f\u5024\u306f\\(x=a\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(-2a^{2}\\)<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(1&lt;a\\)\u306e\u5834\u5408<\/h4>\n\n\n\n<p>\\(1&lt;a\\)\u306e\u3068\u304d\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"480\" height=\"253\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082-1.png\" alt=\"\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082\" class=\"wp-image-5570\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082-1.png 480w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u54082-1-300x158.png 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(1&lt;a\\)\u306e\u3068\u304d\u3001\\(x=1\\)\u3067\u6700\u5c0f\u5024\u3092\u3068\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u6700\u5c0f\u5024\u306f\\(x=1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(2-4a\\)<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u89e3\u7b54<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(a&lt;0\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50240<\/p>\n\n\n\n<p>\\(0\u2266a\u22661\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(-2a^{2}\\)<\/p>\n\n\n\n<p>\\(1&lt;a\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(2-4a\\)<\/p>\n<\/div><\/div>\n\n\n\n<p>\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3082\u304b\u306a\u308a\u8907\u96d1\u3060\u3063\u305f\u306e\u3067\u3001\u5206\u304b\u308a\u3084\u3059\u3044\u89e3\u8aac\u52d5\u753b\u3082\u3064\u3051\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\uff12\u6b21\u95a2\u6570\u306e\u6700\u5927\u30fb\u6700\u5c0f\u2463\u3000\u30fb\u3000\u52d5\u304f\u8ef8\u7de8<\/p>\n\n\n\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/aVSAMNit2Rc\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mondai\">\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u300a\u7df4\u7fd2\u554f\u984c\u300b<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"400\" height=\"373\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u8d64-e1632795801265.png\" alt=\"\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u300a\u7df4\u7fd2\u554f\u984c\u300b\" class=\"wp-image-7253\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u8d64-e1632795801265.png 400w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u8d64-e1632795801265-300x280.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n<\/div>\n\n\n<p>2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u6c42\u3081\u65b9\u30924\u3064\u306e\u30bf\u30a4\u30d7\u306b\u5206\u3051\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>4\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u5b9f\u969b\u306b\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3092\u6c42\u3081\u308b\u7df4\u7fd2\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7df4\u7fd2\u554f\u984c1<\/h3>\n\n\n\n<p>\u6b21\u306e2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u3092\u6c42\u3081\u3088\u3046\u3002<\/p>\n\n\n\n<p>\\(y=x^{2}+2x+3\u3000(-2\u2266x\u22662)\\)<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;x^{2}+2x+3\\\\<br>&amp;=&amp;(x+1)^{2}+2<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3053\u3053\u3067\\(-2\u2266x\u22662\\)\u306a\u306e\u3067\u3001\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u5b9f\u8df5\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"426\" height=\"270\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c1.png\" alt=\"\u7df4\u7fd2\u554f\u984c1\" class=\"wp-image-5554\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c1.png 426w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c1-300x190.png 300w\" sizes=\"(max-width: 426px) 100vw, 426px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u30b0\u30e9\u30d5\u306e\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5927\u306a\u306e\u306f\\(x=2\\)\u306e\u3068\u304d\u306e\\(y=11\\)<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u5b9f\u8df5\u90e8\u5206\u3067\u6700\u5c0f\u306a\u306e\u304c\\(x=-1\\)\u306e\u3068\u304d\u306e\\(y=2\\)\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u6c42\u3081\u308b\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=2\\)\u306e\u3068\u304d\u3001\u6700\u5927\u502411<br>\\(x=-1\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u50242<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7df4\u7fd2\u554f\u984c2<\/h3>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(y=x^{2}-4x+1\u3000(0\u2266x\u2266a)\\)<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u95a2\u6570\u3092\u5909\u5f62\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>y&amp;=&amp;x^{2}-4x+1\\\\<br>&amp;=&amp;(x-2)^{2}-3<br>\\end{eqnarray}<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\u3053\u3053\u3067\\(a\\)\u306e\u5024\u306b\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e4\u3064\u306e\u5834\u5408\u5206\u3051\u3057\u307e\u3059\u3002<br>\\(0&lt;a&lt;2\\)\u306e\u3068\u304d<br>\\(2\u2266a&lt;4\\)\u306e\u3068\u304d<br>\\(a=4\\)\u306e\u3068\u304d<br>\\(4&lt;a\\)\u306e\u3068\u304d<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(0&lt;a&lt;2\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(0&lt;a&lt;2\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"368\" height=\"250\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2.png\" alt=\"\u7df4\u7fd2\u554f\u984c2\" class=\"wp-image-5555\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2.png 368w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-300x204.png 300w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(0&lt;a&lt;2\\)\u306e\u3068\u304d\u3001\\(y=(x-2)^{2}-3\\)\u306e\u8ef8\u306f\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(0&lt;a&lt;2\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241<br>\\(x=a\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\\(a^{2}-4a+1\\)<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(2\u2266a&lt;4\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(2\u2266a&lt;4\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"363\" height=\"262\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-1.png\" alt=\"\u7df4\u7fd2\u554f\u984c2-1\" class=\"wp-image-5556\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-1.png 363w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-1-300x217.png 300w\" sizes=\"(max-width: 363px) 100vw, 363px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(2\u2266a&lt;4\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024\u306f\u9802\u70b9\u306b\u306a\u308b\u3053\u3068\u304c\u56f3\u304b\u3089\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(2\u2266a&lt;4\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241<br>\\(x=2\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(a=4\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(a=4\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"406\" height=\"257\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-2.png\" alt=\"\u7df4\u7fd2\u554f\u984c2-2\" class=\"wp-image-5557\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-2.png 406w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-2-300x190.png 300w\" sizes=\"(max-width: 406px) 100vw, 406px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(a=4\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\u3092\u3068\u308b\u70b9\u304c2\u3064\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(a=4\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=0,4\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241<br>\\(x=2\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\\(4&lt;a\\)\u306e\u3068\u304d<\/h4>\n\n\n\n<p>\\(4&lt;a\\)\u306e\u3068\u304d\u3001\u5b9a\u7fa9\u57df\u306b\u542b\u307e\u308c\u308b\u30b0\u30e9\u30d5\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"368\" height=\"265\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-3.png\" alt=\"\u7df4\u7fd2\u554f\u984c2-3\" class=\"wp-image-5558\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-3.png 368w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u7df4\u7fd2\u554f\u984c2-3-300x216.png 300w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/figure>\n<\/div>\n\n\n<p>\\(4&lt;a\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\u306f\u53f3\u7aef\u306e\u70b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(4&lt;a\\)\u306e\u3068\u304d\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\\(x=a\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\\(a^{2}-4a+1\\)<br>\\(x=2\\)\u306e\u3068\u304d\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<p>\u3088\u3063\u3066\u3001\\((0\u2266x\u2266a)\\)\u306b\u304a\u3051\u308b\\(y=x^{2}-4x+1\\)\u306e\u6700\u5927\u5024\u3001\u6700\u5c0f\u5024\u306f<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u89e3\u7b54<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(0&lt;a&lt;2\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241\u3001\u6700\u5c0f\u5024\\(a^{2}-4a+1\\)<\/p>\n\n\n\n<p>\\(2\u2266a&lt;4\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<p>\\(a=4\\)\u306e\u3068\u304d\u3001\u6700\u5927\u50241\u3001\u6700\u5c0f\u5024-3<\/p>\n\n\n\n<p>\\(4&lt;a\\)\u306e\u3068\u304d\u3001\u6700\u5927\u5024\\(a^{2}-4a+1\\)\u3001\u6700\u5c0f\u5024-3<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n<p><span class=\"huto\">\u4eca\u56de\u306f2\u6b21\u95a2\u6570\u306e\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e\u6c42\u3081\u65b9\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306e4\u30d1\u30bf\u30fc\u30f3<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\u7bc4\u56f2\u304c\u306a\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u304c\u3042\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n\n\n\n<li>\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p><span class=\"huto\">\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u306f\u307e\u305a\u30b0\u30e9\u30d5\u3092\u66f8\u304f\u3068\u89e3\u304d\u3084\u3059\u304f\u306a\u308b\u3002<\/span><\/p>\n\n\n\n<p><span class=\"huto\">\u7bc4\u56f2\u3084\u8ef8\u306b\u6587\u5b57\u3092\u542b\u3080\u5834\u5408\u306f\u5834\u5408\u5206\u3051\u304c\u5fc5\u8981\u3002<\/span><\/p>\n\n\n\n<p>\u95a2\u6570\u3092\u307f\u3066\u6700\u5927\u5024\u30fb\u6700\u5c0f\u5024\u3092\u5224\u65ad\u3059\u308b\u306e\u306f\u96e3\u3057\u3044\u3067\u3059\u3002<br>\u5b9f\u969b\u306b<span 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