{"id":21395,"date":"2026-02-04T14:24:06","date_gmt":"2026-02-04T05:24:06","guid":{"rendered":"https:\/\/math-travel.jp\/?p=21395"},"modified":"2026-03-06T01:06:59","modified_gmt":"2026-03-05T16:06:59","slug":"solution-formula","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-1\/solution-formula\/","title":{"rendered":"\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u3068\u306f\uff1f\u899a\u3048\u65b9\u3068\u8a08\u7b97\u3092\u30e9\u30af\u306b\u3059\u308b\u4f7f\u3044\u65b9\u3092\u4f8b\u984c\u3067\u30de\u30b9\u30bf\u30fc"},"content":{"rendered":"\n<p>\u6570\u5b66\u2160\u4e8c\u6b21\u95a2\u6570\u306b\u306f\u300c<span class=\"hutoaka\">\u89e3\u306e\u516c\u5f0f<\/span>\u300d\u3092\u6d3b\u7528\u3059\u308b\u554f\u984c\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-group is-style-big_kakko_box\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><span class=\"huto\">\u300c\u89e3\u306e\u516c\u5f0f\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u300d<\/span><br><span class=\"huto\">\u300c\u89e3\u306e\u516c\u5f0f\u304c\u4f7f\u3044\u3053\u306a\u305b\u306a\u3044\u300d<\/span><\/p>\n<\/div><\/div>\n\n\n\n<p>\u4eca\u56de\u306f\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"356\" height=\"123\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png\" alt=\"\u89e3\u306e\u516c\u5f0f\" class=\"wp-image-5580\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png 356w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f-300x104.png 300w\" sizes=\"(max-width: 356px) 100vw, 356px\" \/><figcaption class=\"wp-element-caption\">\u89e3\u306e\u516c\u5f0f<\/figcaption><\/figure>\n<\/div>\n\n\n<p>\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u30921\u767a\u3067\u6c42\u3081\u3089\u308c\u308b\u516c\u5f0f\u304c\u89e3\u306e\u516c\u5f0f\u3067\u3059\u3002<br>\u672c\u8a18\u4e8b\u3067\u306f<span class=\"hutoaka\">\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u306e\u4f7f\u3044\u65b9\u3092\u89e3\u8aac<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3082\u305d\u3082&#8221;\u89e3&#8221;\u3068\u306f\u4f55\u306a\u306e\u304b\u3001\u305d\u3046\u3044\u3063\u305f\u57fa\u790e\u304b\u3089\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"toha\">2\u6b21\u95a2\u6570\u3068\u306f<\/h2>\n\n\n\n<p>2\u6b21\u95a2\u6570\u3068\u306f\u6700\u5927\u6b21\u6570\u304c2\u306e\u95a2\u6570\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"393\" height=\"141\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u95a2\u6570.png\" alt=\"2\u6b21\u95a2\u6570\" class=\"wp-image-5581\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u95a2\u6570.png 393w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u95a2\u6570-300x108.png 300w\" sizes=\"(max-width: 393px) 100vw, 393px\" \/><\/figure>\n<\/div>\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<p>\u25a0 2\u6b21\u95a2\u6570\u306e\u4f8b<\/p>\n\n\n\n<p>\\\\(y=x^{2}+3x+4\\)<br>\\(y=x^{2}\\)<br>\\(y=x^{2}-5\\)<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u95a2\u6570\u3068\u306f\uff1f<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(x\\)\u306e\u5024\u30921\u3064\u6c7a\u3081\u305f\u3068\u304d\u3001\u305d\u308c\u306b\u4f34\u3063\u3066\\(y\\)\u306e\u5024\u30821\u3064\u306b\u6c7a\u307e\u308b\u6570\u5f0f\u306e\u3053\u3068\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p>2\u6b21\u95a2\u6570\u3092\u7dcf\u5fa9\u7fd2\u3057\u305f\u3044\u65b9\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p>\uff1e\uff1e2\u6b21\u95a2\u6570\u306e\u516c\u5f0f\u3068\u91cd\u8981\u30dd\u30a4\u30f3\u30c8\u307e\u3068\u3081<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kai\">\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3068\u89e3<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1200\" height=\"655\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2026\/02\/solution-formula-illustration-0.webp\" alt=\"\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3068\u89e3\" class=\"wp-image-21569\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2026\/02\/solution-formula-illustration-0.webp 1200w, https:\/\/math-travel.jp\/wp-content\/uploads\/2026\/02\/solution-formula-illustration-0-768x419.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p>\u305d\u3057\u3066\u30012\u6b21\u95a2\u6570\u306e\u65b9\u7a0b\u5f0f\u3092<span class=\"huto\">\u4e8c\u6b21\u65b9\u7a0b\u5f0f<\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"466\" height=\"131\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u65b9\u7a0b\u5f0f.png\" alt=\"\u4e8c\u6b21\u65b9\u7a0b\u5f0f\" class=\"wp-image-5578\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u65b9\u7a0b\u5f0f.png 466w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u4e8c\u6b21\u65b9\u7a0b\u5f0f-300x84.png 300w\" sizes=\"(max-width: 466px) 100vw, 466px\" \/><\/figure>\n<\/div>\n\n\n<p>\u4ee3\u8868\u7684\u306a\u5f62\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n<p>\\[ax^{2}+bx+c=0\\]<\/p>\n\n\n\n<p>\\(a,b,c\\)\u306f\u4fc2\u6570\u3067\u3001\\(a \\neq 0\\)\u3067\u3059\u3002\uff08\\(a=0\\)\u3060\u30681\u6b21\u5f0f\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3002\uff09<\/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<p>\u25a0 2\u6b21\u65b9\u7a0b\u5f0f\u306e\u4f8b<\/p>\n\n\n\n<p>\\(x^{2}+5x+4=0\\)<strong><br><\/strong>\\(-2^{2}+3x+1=0\\)<\/p>\n<\/div><\/div>\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>\\(x^{3}+3x^{2}+x+4=0\\)\u306f3\u6b21\u65b9\u7a0b\u5f0f<br>\\(x^{4}+5x^{3}+2x^{2}+x+4=0\\)\u306f4\u6b21\u65b9\u7a0b\u5f0f<\/p>\n<\/div><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u4e8c\u6b21\u65b9\u7a0b\u5f0f\\(ax^{2}+bx+c=0\\)\u3092\u6210\u308a\u7acb\u305f\u305b\u308b\\(x\\)\u306e\u5024\u3092<span class=\"hutoaka\">\u65b9\u7a0b\u5f0f\u306e\u89e3<\/span>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u7684\u306b\u8a00\u3046\u3068\u3001\\(x^{2}-5x+4=0\\)\u306e\u89e3\u306f\\(x=1,4\\)\u3067\u3059\u3002<\/p>\n\n\n\n<p>\\(x=1\\)\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001<br>\\[1^{2}-5 \\cdot 1+4=0\\]<\/p>\n\n\n\n<p>\\(x=4\\)\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001<br>\\[4^{2}-5 \\cdot 4+4=0\\]<\/p>\n\n\n\n<p>\u78ba\u304b\u306b\\(x=1,4\\)\u306e\u3068\u304d\u306b\u65b9\u7a0b\u5f0f\u304c\u6210\u308a\u7acb\u3064\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3061\u306a\u307f\u306b\u3001\\(x^{2}-5x+4=0\\)\u306e\u89e3\u3068\u3044\u3046\u306e\u306f\\(y=x^{2}-5x+4\\)\u306e\u30b0\u30e9\u30d5\u3068x\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u6307\u3057\u307e\u3059\u3002<br>\u3064\u307e\u308a\u3001\\(x=1,4\\)\u304c\u65b9\u7a0b\u5f0f\u306e\u89e3\u306a\u3089\u3070\u4e0b\u56f3\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"391\" height=\"289\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u65b9\u7a0b\u5f0f\u306e\u89e3\u304c\u8868\u3059\u3082\u306e.png\" alt=\"\u65b9\u7a0b\u5f0f\u306e\u89e3\u304c\u8868\u3059\u3082\u306e\" class=\"wp-image-5579\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u65b9\u7a0b\u5f0f\u306e\u89e3\u304c\u8868\u3059\u3082\u306e.png 391w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u65b9\u7a0b\u5f0f\u306e\u89e3\u304c\u8868\u3059\u3082\u306e-300x222.png 300w\" sizes=\"(max-width: 391px) 100vw, 391px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"koushiki\">\u89e3\u306e\u516c\u5f0f\u3068\u4e8c\u6b21\u65b9\u7a0b\u5f0f<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"500\" height=\"365\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/Mathematics-cuate-e1633999100291.png\" alt=\"\u89e3\u306e\u516c\u5f0f\u3068\u4e8c\u6b21\u65b9\u7a0b\u5f0f\" class=\"wp-image-7269\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/Mathematics-cuate-e1633999100291.png 500w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/Mathematics-cuate-e1633999100291-300x219.png 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p><span class=\"huto\">\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u6c42\u3081\u65b9\u306f\u4e3b\u306b2\u3064\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u6c42\u3081\u65b9<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\u56e0\u6570\u5206\u89e3\u3057\u3066\u6c42\u3081\u308b<\/li>\n\n\n\n<li>\u89e3\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u6c42\u3081\u308b<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u4e0b\u306e\u6570\u5f0f\u304c\u89e3\u306e\u516c\u5f0f\u3067\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"356\" height=\"123\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png\" alt=\"\u89e3\u306e\u516c\u5f0f\" class=\"wp-image-5580\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png 356w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f-300x104.png 300w\" sizes=\"(max-width: 356px) 100vw, 356px\" \/><\/figure>\n<\/div>\n\n\n<p>\u89e3\u306e\u516c\u5f0f\u3092\u4f7f\u3046\u3068\u3069\u3093\u306a\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3067\u3082\u3001\u7c21\u5358\u306b\u89e3\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u56e0\u6570\u5206\u89e3\u3067\u89e3\u3092\u6c42\u3081\u308b<\/h3>\n\n\n\n<p>\u89e3\u306e\u516c\u5f0f\u3092\u89e3\u8aac\u3059\u308b\u524d\u306b\u56e0\u6570\u5206\u89e3\u3067\u6c42\u3081\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5fc5\u305a\u62bc\u3055\u3048\u3066\u6b32\u3057\u3044\u306e\u3067\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>x^{2}-5x+4&amp;=&amp;0\\\\<br>(x-1)(x-4)&amp;=&amp;0<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(x=1,4\\)<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>2x^{2}-4x-6&amp;=&amp;0\\\\<br>2(x^{2}-2x-3)&amp;=&amp;0\\\\<br>2(x+1)(x-3)&amp;=&amp;0<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\\(x=-1,3\\)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u89e3\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u6c42\u3081\u308b<\/h3>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u89e3\u306e\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<p><img decoding=\"async\" width=\"356\" height=\"123\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png\" alt=\"\u89e3\u306e\u516c\u5f0f\"><\/p>\n<\/div><\/div>\n\n\n\n<p>\u304b\u306a\u308a\u4fbf\u5229\u306a\u516c\u5f0f\u306a\u306e\u3067<span class=\"hutoaka\">\u89e3\u306e\u516c\u5f0f\u306f\u5fc5\u305a\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n<p>\u306a\u305c\u306a\u3089\u3001\u516c\u5f0f\u306b\u4ee3\u5165\u3059\u308b\u3060\u3051\u3067<span class=\"yellow-hoso\">\u3069\u3093\u306a\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u3082\u6c42\u3081\u3089\u308c\u308b<\/span>\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e0b\u306e\u65b9\u7a0b\u5f0f\u3088\u3046\u306a\u30ad\u30ec\u30a4\u306b\u56e0\u6570\u5206\u89e3\u304c\u3067\u304d\u306a\u3044\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3067\u3082\u7c21\u5358\u306b\u89e3\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\(x^{2}+4x-2=0\\)<\/p>\n\n\n\n<p>\\(a=1,b=4,c=-2\\)\u3068\u3057\u3066\u3001\u89e3\u306e\u516c\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\frac{-b\u00b1\\sqrt{b^{2}-4ac}}{2a}&amp;=&amp;\\frac{-4\u00b1\\sqrt{4^{2}-4 \\cdot 1 \\cdot (-2)}}{2 \\cdot 1}\\\\<br>&amp;=&amp;\\frac{-4\u00b1\\sqrt{16+8}}{2}\\\\<br>&amp;=&amp;\\frac{-4\u00b1\\sqrt{24}}{2}\\\\<br>&amp;=&amp;-2\u00b1\\sqrt{6}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p>\\(x=-2\u00b1\\sqrt{6}\\)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mondai\">\u89e3\u306e\u516c\u5f0f\u300a\u7df4\u7fd2\u554f\u984c\u300b<\/h2>\n\n\n\n<p>\u89e3\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u3092\u6c42\u3081\u308b\u7df4\u7fd2\u3092\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u7df4\u7fd2\u554f\u984c<\/span><\/div><div class=\"cap_box_content\">\n<p>\u6b21\u306e\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u3092\u6c42\u3081\u3088\u3046\u3002<\/p>\n\n\n\n<p>(1)\u3000\\(x^{2}-x-3=0\\)<br>(2)\u3000\\(-2x^{2}+x-3=0\\)<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\\(x^{2}-x-3=0\\)<\/h3>\n\n\n\n<p>\\(a=1,b=-1,c=-3\\)\u3068\u3057\u3066\u3001\u89e3\u306e\u516c\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\frac{-b\u00b1\\sqrt{b^{2}-4ac}}{2a}&amp;=&amp;\\frac{-(-1)\u00b1\\sqrt{(-1)^{2}-4 \\cdot 1 \\cdot (-3)}}{2 \\cdot 1}\\\\<br>&amp;=&amp;\\frac{1\u00b1\\sqrt{1+12}}{2}\\\\<br>&amp;=&amp;\\frac{1\u00b1\\sqrt{13}}{2}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p>\\[\\displaystyle x=\\frac{1\u00b1\\sqrt{13}}{2}\\]<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\\(-2x^{2}+x+3=0\\)<\/h3>\n\n\n\n<p>\\(a=-2,b=1,c=-3\\)\u3068\u3057\u3066\u3001\u89e3\u306e\u516c\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\\frac{-b\u00b1\\sqrt{b^{2}-4ac}}{2a}&amp;=&amp;\\frac{-1\u00b1\\sqrt{1^{2}-4 \\cdot (-2) \\cdot 3}}{2 \\cdot (-2)}\\\\<br>&amp;=&amp;\\frac{-1\u00b1\\sqrt{1+24}}{-4}\\\\<br>&amp;=&amp;\\frac{1\u00b15}{4}<br>\\end{eqnarray}<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n\n<p>\\[\\displaystyle x=-1,\\frac{3}{2}\\]<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">\u89e3\u306e\u516c\u5f0f \u307e\u3068\u3081<\/h2>\n\n\n\n<p><span class=\"huto\">\u4eca\u56de\u306f\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"356\" height=\"123\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png\" alt=\"\u89e3\u306e\u516c\u5f0f\" class=\"wp-image-5580\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f.png 356w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u89e3\u306e\u516c\u5f0f-300x104.png 300w\" sizes=\"(max-width: 356px) 100vw, 356px\" \/><\/figure>\n<\/div>\n\n\n<p><span class=\"huto\">\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u6c42\u3081\u65b9\u306f\u4e3b\u306b2\u3064<\/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<ul class=\"wp-block-list\">\n<li>\u56e0\u6570\u5206\u89e3\u3057\u3066\u6c42\u3081\u308b<\/li>\n\n\n\n<li>\u89e3\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u6c42\u3081\u308b<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u89e3\u306e\u516c\u5f0f\u3092\u4f7f\u3048\u3070\u3069\u3093\u306a\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3067\u3082\u89e3\u3051\u308b\u306e\u3067<span class=\"hutoaka\">\u8d85\u4fbf\u5229\uff01<\/span><\/p>\n\n\n\n<div class=\"wp-block-group has-border -border02 is-style-bg_grid\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div id=\"kv\">\n        <p>ax<sup>2<\/sup>+bx+c=0 \u306e\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u3092\u5c0e\u51fa\u3057\u307e\u3059\u3002<br>\n          \u4fc2\u6570\u3092\u5165\u529b\u5f8c\u3001\u7b97\u51fa\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n      <\/div>\n      <div class=\"input-coefficient\">\n        <div class=\"number-item\">\n          <label>a:<\/label>\n          <input type=\"number\" name=\"a1\" class=\"a1\">\n        <\/div>\n        <div class=\"number-item\">\n          <label>b:<\/label>\n          <input type=\"number\" name=\"a2\" class=\"a2\">\n        <\/div>\n        <div class=\"number-item\">\n          <label>c:<\/label>\n          <input type=\"number\" name=\"a3\" class=\"a3\">\n        <\/div>\n      <\/div>\n      <div class=\"output\">\n        <p><span id=\"origin-formula\"><\/span> \u306e\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306f\u3001<span class=\"sp\"><br><\/span><span class=\"bold\">x=<span id=\"result\"><\/span><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n      <\/div>\n      <div class=\"output-error\">\n        <p>a \u306e\u5024\u306f0\u4ee5\u5916\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n      <\/div>\n      <div class=\"btn\">\n        <input type=\"button\" value=\"\u7b97\u51fa\" id=\"cal-btn\">\n        <input type=\"button\" value=\"\u30ea\u30bb\u30c3\u30c8\" id=\"reset-btn\">\n      <\/div>\n<\/div><\/div>\n\n\n\n<p>\u89e3\u306e\u516c\u5f0f\u306f\u4e2d\u5b66\u30fb\u9ad8\u6821\u3067\u591a\u7528\u3059\u308b\u516c\u5f0f\u306a\u306e\u3067\u3001\u5fc5\u305a\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><span class=\"hutoaka\">\u5224\u5225\u5f0fD<\/span>\u3092\u7528\u3044\u308b\u3068\u89e3\u306e\u500b\u6570\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u6700\u5f8c\u307e\u3067\u3054\u89a7\u3044\u305f\u3060\u304d\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u307f\u3093\u306a\u306e\u52aa\u529b\u304c\u5831\u308f\u308c\u307e\u3059\u3088\u3046\u306b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u5b66\u2160\u4e8c\u6b21\u95a2\u6570\u306b\u306f\u300c\u89e3\u306e\u516c\u5f0f\u300d\u3092\u6d3b\u7528\u3059\u308b\u554f\u984c\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002 \u300c\u89e3\u306e\u516c\u5f0f\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u300d\u300c\u89e3\u306e\u516c\u5f0f\u304c\u4f7f\u3044\u3053\u306a\u305b\u306a\u3044\u300d \u4eca\u56de\u306f\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002 \u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u30921\u767a\u3067\u6c42\u3081\u3089\u308c\u308b\u516c\u5f0f\u304c\u89e3\u306e\u516c\u5f0f\u3067\u3059\u3002 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5577,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[21,222],"tags":[],"class_list":["post-21395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nizikansuu","category-math-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u89e3\u306e\u516c\u5f0f\u3068\u306f\uff1f\u899a\u3048\u65b9\u3068\u8a08\u7b97\u3092\u30e9\u30af\u306b\u3059\u308b\u4f7f\u3044\u65b9\u3092\u4f8b\u984c\u3067\u30de\u30b9\u30bf\u30fc<\/title>\n<meta name=\"description\" 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