{"id":3767,"date":"2025-12-24T17:21:35","date_gmt":"2025-12-24T08:21:35","guid":{"rendered":"https:\/\/math-travel.com\/?p=3767"},"modified":"2026-02-11T17:32:04","modified_gmt":"2026-02-11T08:32:04","slug":"tousasuuretu","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-b\/tousasuuretu\/","title":{"rendered":"\u7b49\u5dee\u6570\u5217\u306e\u516c\u5f0f\u307e\u3068\u3081\uff1a\u4e00\u822c\u9805\u30fb\u548c\u306e\u6c42\u3081\u65b9\u3092\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n

\u6570\u5b66B\u6570\u5217\u306e\u4e2d\u3067\u3082\u300c\u7b49\u5dee\u6570\u5217<\/span>\u300d\u306f\u5fc5\u305a\u7406\u89e3\u3057\u3066\u6b32\u3057\u3044\u6570\u5217\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

\u4eca\u56de\u89e3\u6c7a\u3059\u308b\u60a9\u307f<\/span><\/div>
\n

\u300c\u7b49\u5dee\u6570\u5217\u3063\u3066\u306a\u306b\uff1f\u300d <\/p>\n\n\n\n

\u300c\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306e\u6c42\u3081\u65b9\u306f\uff1f\u300d <\/p>\n\n\n\n

\u300c\u548c\u306e\u516c\u5f0f\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u300d<\/p>\n<\/div><\/div>\n\n\n\n

\u4eca\u56de\u306f\u7b49\u5dee\u6570\u5217\u306b\u95a2\u3059\u308b\u3053\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u4e00\u822c\u9805\u3084\u6570\u5217\u306e\u548c\u304c\u3088\u304f\u5206\u304b\u3089\u306a\u304f\u3066\u2026<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u7b49\u5dee\u6570\u5217\u3068\u306f\u300c\u4e00\u5b9a\u306e\u5dee\u3067\u5909\u5316\u3057\u3066\u3044\u304f\u6570\u5217\u300d\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\"<\/figure>\n<\/div>\n\n\n

\u6570\u5217\u3092\u5b66\u7fd2\u3059\u308b\u3046\u3048\u3067\u3001\u7b49\u5dee\u6570\u5217\u306f\u91cd\u8981\u306a\u6570\u5217\u306e1\u3064\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u3092\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u304a\u304b\u306a\u3044\u3068\u3001\u3053\u306e\u5148\u306e\u5358\u5143\u3067\u304b\u306a\u308a\u82e6\u6226\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u672c\u8a18\u4e8b\u3067\u306f\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u3068\u548c\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u6570\u5217\u304c\u82e6\u624b\u306a\u65b9\u3084\u3001\u3053\u308c\u304b\u3089\u6570\u5217\u3092\u5b66\u7fd2\u3059\u308b\u65b9\u306e\u53c2\u8003\u306b\u306a\u308b\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u6c17\u306b\u306a\u308b\u898b\u51fa\u3057\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u3001
\u305c\u3072\u6700\u5f8c\u307e\u3067\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u7b49\u5dee\u6570\u5217\u3068\u306f\uff1f<\/h2>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u3068\u306f\u3001\u300c\u4e00\u5b9a\u306e\u5dee\u3067\u5909\u5316\u3059\u308b\u6570\u5217\u300d<\/span>\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\"<\/figure>\n<\/div>\n\n\n

\u6570\u5217\u306e\u521d\u3081\u306e\u9805\u3092\u521d\u9805\u3001\u6700\u5f8c\u306e\u9805\u3092\u672b\u9805\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

\u307e\u305f\u3001\u7b49\u5dee\u6570\u5217\u306b\u304a\u3044\u3066\u96a3\u308a\u5408\u3046\uff12\u3064\u306e\u9805\u306e\u5dee\u3092\u516c\u5dee\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6570\u5217\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n

\u3053\u306e\u6570\u5217\u306f\u300c\u521d\u98055\u3001\u672b\u980540\u3001\u516c\u5dee7\u3001\u9805\u65706\u306e\u7b49\u5dee\u6570\u5217\u300d\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\u3068\u306f\uff1f\"<\/figure>\n<\/div>\n\n\n
\u7b49\u5dee\u6570\u5217<\/span><\/div>
\n

\u7b49\u5dee\u6570\u5217\u3000\u21d2\u4e00\u5b9a\u306e\u5dee\u3067\u5909\u5316\u3059\u308b\u6570\u5217<\/p>\n\n\n\n

\u516c\u5dee\uff1a\u96a3\u308a\u3042\u3046\u9805\u306e\u5dee<\/p>\n\n\n\n

\u521d\u9805\uff1a\u6700\u521d\u306e\u9805<\/p>\n\n\n\n

\u672b\u9805\uff1a\u6700\u5f8c\u306e\u9805<\/p>\n<\/div><\/div>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u3092\u4e00\u822c\u9805\u3067\u8868\u3059<\/h2>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306e\u516c\u5f0f<\/h3>\n\n\n\n

\u4e00\u822c\u9805\u3068\u306f\u3001\u6570\u5217\u306e\u7b2c\\(n\\)\u9805\\(a_{n}\\)\u3092\\(n\\)\u3092\u7528\u3044\u3066\u8868\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u8868\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805<\/span><\/div>
\n

\u521d\u9805\\(a_{1}\\)\u3001\u516c\u5dee\\(d\\)\u306e\u7b49\u5dee\u6570\u5217\u3092\\(\\{a_{n}\\}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\(a_{n}=a_{1} + (n-1)d\\)<\/p>\n<\/div><\/div>\n\n\n

\"\"\u9ad8\u6821\u751f<\/span><\/div>
\n

\u306a\u3093\u3060\u304b\u96e3\u3057\u3044\u5f62\u3092\u3057\u3066\u3044\u308b\u306d\u2026<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u516c\u5f0f\u306e\u8a3c\u660e\u3092\u898b\u308c\u3070\u3001\u3053\u306e\u5f62\u306b\u306a\u308b\u306e\u3082\u7d0d\u5f97\u3067\u304d\u308b\u3088\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306e\u8a3c\u660e<\/h3>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306f\u521d\u9805\u306b\u516c\u5dee\u3092\u52a0\u3048\u3066\u3044\u304f\u6570\u5217\u3067\u3059\u3002<\/p>\n\n\n\n

\u6570\u5217\\(a_{1}\u3000a_{2}\u3000a_{3}\u3000a_{4} …\u3000a_{n}\\)\u304c\u7b49\u5dee\u6570\u5217\u3060\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u3053\u306e\u7b49\u5dee\u6570\u5217\u306e\u516c\u5dee\u3092\\(d\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\n

\\(a_{1}=a_{1}\\)\u2190\u521d\u9805<\/p>\n\n\n\n

\\(a_{2}=a_{1} + d\\)<\/p>\n\n\n\n

\\(a_{3}=a_{1} + 2d\\)<\/p>\n\n\n\n

\\(a_{4}=a_{1} + 3d\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u306e\u3088\u3046\u306b\u521d\u9805\u306b\u516c\u5dee\u3092\u52a0\u3048\u3066\u3044\u304f\u306e\u3067\u3001<\/p>\n\n\n\n

\n

\\(a_{1}=a_{1}\\)<\/p>\n\n\n\n

\\(a_{2}=a_{1} + d\\)<\/p>\n\n\n\n

\\(a_{3}=a_{1} + 2d\\)<\/p>\n\n\n\n

\uff1a<\/p>\n\n\n\n

\\(a_{n}=a_{1} + (n-1)d\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306f\\(a_{n}=a_{1} + (n-1)d\\)\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u5177\u4f53\u7684\u306a\u6570\u5b57\u3092\u4f7f\u3063\u3066\u4e00\u822c\u9805\u3092\u8003\u3048\u3066\u307f\u3088\u3046\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u3092\u6c42\u3081\u308b<\/h3>\n\n\n\n

\u3053\u3053\u306b\u7b49\u5dee\u6570\u5217\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

3 , 7 , 11 , 15 , 19 , 23 ,27 \u2026<\/p>\n\n\n\n

\u3053\u306e\u6570\u5217\u306f\u300c\u521d\u98053\u3001\u516c\u5dee4\u306e\u7b49\u5dee\u6570\u5217\u300d\u3067\u3059\u3002<\/p>\n\n\n\n

\u3053\u3053\u3067\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u306e\u516c\u5f0f\u3092\u601d\u3044\u51fa\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805<\/span><\/div>
\n

\u521d\u9805\\(a_{1}\\)\u3001\u516c\u5dee\\(d\\)\u306e\u7b49\u5dee\u6570\u5217\u3092\\(\\{a_{n}\\}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\(a_{n}=a_{1} + (n-1)d\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u306e\u6570\u5217\u306f\\(a_{1}=3\u3001d=4\\)\u306e\u7b49\u5dee\u6570\u5217\u306a\u306e\u3067\u6c42\u3081\u308b\u4e00\u822c\u9805\u306f\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
a_{n}&=&a_{1}+(n-1)d\\\\
&=&3+(n-1)4\\\\
&=&4n-1
\\end{eqnarray}<\/p>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u7b49\u5dee\u6570\u5217\uff5b3 , 7 , 11 , 15 , 19  \u2026\uff5d\u306e\u4e00\u822c\u9805\u306f\\(a_{n}=4n-1\\)<\/p>\n\n\n

\"\"\u30b7\u30fc\u30bf<\/span><\/div>
\n

\u5fc3\u914d\u306a\u3068\u304d\u306f\u4ee3\u5165\u3057\u3066\u78ba\u304b\u3081\u3066\u307f\u3088\u3046\uff01<\/p>\n<\/span><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n

\u4e00\u822c\u9805\u304c\u4e0d\u5b89\u306a\u3068\u304d\u306f\u5177\u4f53\u7684\u306a\u6570\u5b57\u3092\u4ee3\u5165\u3057\u3066\u78ba\u304b\u3081\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u521d\u9805\u304c3\u306a\u306e\u3067\u3001\u4e00\u822c\u9805\u306b\\(n=1\\)\u3092\u4ee3\u5165\u3057\u30663\u306b\u306a\u3089\u306a\u3044\u3068\u304a\u304b\u3057\u3044\u3067\u3059\u3002<\/p>\n\n\n\n

\\begin{eqnarray}
a_{1}&=&4 \\times 1-1\\\\
&=&3
\\end{eqnarray}<\/p>\n\n\n\n

\u3061\u3083\u3093\u3068\u540c\u3058\u5024\u306b\u306a\u3063\u305f\u306e\u3067\u9593\u9055\u3044\u306a\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c<\/h2>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f<\/h3>\n\n\n\n

\u6570\u5217\u306e\u9805\u3092\u8db3\u3059\u3053\u3068\u3092\u6570\u5217\u306e\u548c\u3068\u3044\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217{2 , 5 , 8 , 11}\u306e\u521d\u9805\u304b\u3089\u7b2c4\u9805\u307e\u3067\u306e\u548c\u306f26\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

2+5+8+11=26<\/p>\n\n\n\n

\u3053\u306e\u3088\u3046\u306b\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u554f\u984c\u306f\u3088\u304f\u51fa\u984c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u516c\u5f0f\u304c2\u3064\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u78ba\u5b9f\u306b\u899a\u3048\u3066\u304a\u304d\u305f\u3044\u516c\u5f0f<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c<\/span><\/div>
\n

\u521d\u9805\\(a\\)\u3001\u516c\u5dee\\(d\\)\u3001\u672b\u9805\\(l\\)\u3001\u9805\u6570\\(n\\)\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\\(S_{n}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{n}&=&\\frac{n}{2}(a+l)\\\\
\\displaystyle &=&\\frac{n}{2}\\{2a+(n-1)d\\}
\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

\u5b9f\u969b\u306b\u7b49\u5dee\u6570\u5217\u306e\u548c\u30922\u3064\u306e\u3084\u308a\u65b9\u3067\u6c42\u3081\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f\u2460<\/h3>\n\n\n\n

\u3053\u306e\u3088\u3046\u306a\u7b49\u5dee\u6570\u5217\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\u306e\u548c\"<\/figure>\n<\/div>\n\n\n

\u3053\u308c\u306f\u521d\u98055\u3001\u672b\u980540\u3001\u9805\u65706\u306e\u7b49\u5dee\u6570\u5217\u3067\u3059\u3002<\/p>\n\n\n\n

\u521d\u9805\u3068\u672b\u9805\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u3068\u304d\u306f\u3053\u3063\u3061\u306e\u548c\u306e\u516c\u5f0f\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c<\/span><\/div>
\n

\u521d\u9805\\(a\\)\u3001\u672b\u9805\\(l\\)\u3001\u9805\u6570\\(n\\)\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\\(S_{n}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{n}&=&\\frac{n}{2}(a+l)\\\\
\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u306e\u6570\u5217\u306e\u521d\u9805\u304b\u3089\u7b2c6\u9805\u307e\u3067\u306e\u548c\u306f<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{6}&=&\\frac{6}{2}(5+40)\\\\
&=&3 \\times 45\\\\
&=&135
\\end{eqnarray}<\/p>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f<\/span><\/div>
\n

\u521d\u9805\u3001\u672b\u9805\u3001\u9805\u6570\u304c\u5206\u304b\u308b\u5834\u5408\u306f\u3053\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3002<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{n}&=&\\frac{n}{2}(a+l)
\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f\u2461<\/h3>\n\n\n\n

\u540c\u3058\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\u3082\u30461\u3064\u306e\u6c42\u3081\u65b9\u3067\u6c42\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f\"<\/figure>\n<\/div>\n\n\n

\u3053\u306e\u6570\u5217\u306f\u521d\u98055\u3001\u516c\u5dee7\u3001\u9805\u65706\u306e\u7b49\u5dee\u6570\u5217\u3067\u3059\u3002<\/p>\n\n\n\n

\u521d\u9805\u3001\u516c\u5dee\u3001\u9805\u6570\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u3068\u304d\u306f\u3053\u306e\u516c\u5f0f\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c<\/span><\/div>
\n

\u521d\u9805\\(a\\)\u3001\u516c\u5dee\\(d\\)\u3001\u9805\u6570\\(n\\)\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\\(S_{n}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{n}&=&\\frac{n}{2}\\{2a+(n-1)d\\}
\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u306e\u6570\u5217\u306e\u521d\u9805\u304b\u3089\u7b2c6\u9805\u307e\u3067\u306e\u548c\u306f<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{6}&=&\\frac{6}{2}(2 \\times 5+(6-1)7)\\\\
&=&3 (10 + 35)\\\\
&=&3 \\times 45\\\\
&=&135
\\end{eqnarray}<\/p>\n\n\n\n

\\(\\displaystyle S_{6}=\\frac{6}{2}\\{2 \\times{5}+(6-1)\\times{7}\\}\\)<\/p>\n\n\n\n

\\(\\displaystyle =3(10 + 35)\\)<\/p>\n\n\n\n

\\(=135\\)<\/p>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f<\/span><\/div>
\n

\u521d\u9805\u3001\u516c\u5dee\u3001\u9805\u6570\u304c\u5206\u304b\u308b\u5834\u5408\u306f\u3053\u306e\u516c\u5f0f\u3067\u6c42\u3081\u308b\u3002<\/p>\n\n\n\n

\\begin{eqnarray}
\\displaystyle S_{n}&=&\\frac{n}{2}\\{2a+(n-1)d\\}
\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u03a3<\/h2>\n\n\n\n

\u305d\u3082\u305d\u3082\u03a3\uff08\u30b7\u30b0\u30de\uff09\u3068\u306f\uff1f<\/h3>\n\n\n\n

\u03a3\uff08\u30b7\u30b0\u30de\uff09\u3068\u306f\u6570\u5b66\u306e\u8a18\u53f7\u306e1\u3064\u3067\u3059\u3002<\/p>\n\n\n\n

\u6570\u5217\\(a_{n}\\)\u306e\u521d\u9805\u304b\u3089\u7b2c\\(n\\)\u9805\u307e\u3067\u8db3\u3059\u3053\u3068\u3092\u8a18\u53f7\u03a3\uff08\u30b7\u30b0\u30de\uff09\u3092\u7528\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\\[\\sum_{k=1}^{n} a_{k}=a_{1}+a_{2}+a_{3}+\\cdots+a_{n}\\]<\/p>\n\n\n\n

\\(\\sum_{k=1}^{n}\\)\u306e\u898b\u305f\u76ee\u304c\u96e3\u3057\u305d\u3046\u306a\u306e\u3067\u8eab\u69cb\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u304c\u3001\u30b7\u30b0\u30de\u306e\u610f\u5473\u306f\u300ck=1\u304b\u3089n\u307e\u3067\u4ee3\u5165\u3057\u305f\u3082\u306e\u3092\u8db3\u3059\u300d<\/span>\u3068\u3044\u3046\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n

\u30b7\u30b0\u30de\u03a3\u306e\u516c\u5f0f\u3084\u8a08\u7b97\u306b\u3064\u3044\u3066\u306f\u300c\u03a3\u30b7\u30b0\u30de\u306e\u8a08\u7b97\u516c\u5f0f\u3068\u8a3c\u660e\uff01\u6570\u5217\u306e\u548c\u304c\u4e00\u77ac\u3067\u89e3\u3051\u308b\uff01\u300d\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u03a3<\/h3>\n\n\n\n

\u6b21\u306e\u3088\u3046\u306a\u03a3\u306f\u3001\u7b49\u5dee\u6570\u5217\u306e\u548c\u3068\u3057\u3066\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u03a3<\/span><\/div>
\n

\\[\\sum_{k=1}^{n} k=\\displaystyle \\frac{1}{2}n(n+1)\\]<\/p>\n<\/div><\/div>\n\n\n\n

\u306a\u305c\u3053\u306e\u516c\u5f0f\u306b\u306a\u308b\u306e\u304b\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u307e\u305a\u5de6\u8fba\u306e\u03a3\u3092\u8a08\u7b97\u3057\u3066\u307f\u308b\u3068\u3001<\/p>\n\n\n\n

\\[\\sum_{k=1}^{n} k=1+2+3+ \\cdots + n\\]<\/p>\n\n\n\n

\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u3053\u308c\u306f\u300c\u521d\u98051\u3001\u672b\u9805n\u3001\u9805\u6570n\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u300d\u3068\u540c\u3058\u5f62\u3067\u3059\u306d\u3002<\/p>\n\n\n\n

\u305d\u3053\u3067\u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f\u3092\u7528\u3044\u308b\u3068\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
\\sum_{k=1}^{n} k&=&1+2+3+ \\cdots + n\\\\
\\displaystyle &=&\\frac{1}{2}n(n+1)
\\end{eqnarray}<\/p>\n\n\n\n

\u3053\u308c\u3067\u7b49\u5dee\u6570\u5217\u306e\u03a3\u3092\u548c\u306e\u516c\u5f0f\u3067\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u03a3\u3092\u6c42\u3081\u308b<\/h3>\n\n\n\n

\u4f8b\u984c\u3068\u3057\u3066\u30011\u554f\u03a3\u306e\u8a08\u7b97\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u03a3<\/span><\/div>
\n

\u6b21\u306e\u5024\u3092\u6c42\u3081\u3066\u307f\u3088\u3046\u3002<\/p>\n\n\n\n

\\[\\sum_{k=1}^{7} k\\]<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u306e\u8a08\u7b97\u304c\u610f\u5473\u3059\u308b\u306e\u306f\u3001\\(1+2+3+\\cdots+7\\)\u306a\u306e\u3067\u3001\u300c\u521d\u9805\uff11\u3001\u672b\u9805\uff17\u3001\u9805\u6570\uff17\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u300d\u3068\u3057\u3066\u8003\u3048\u308b\u3068\u3001<\/p>\n\n\n\n

\\begin{eqnarray}
\\sum_{k=1}^7 k&=&1+2+3+ \\cdots + 7\\\\
\\displaystyle &=&\\frac{1}{2}7(7+1)\\\\
\\displaystyle &=&28
\\end{eqnarray}<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6f38\u5316\u5f0f<\/h2>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6f38\u5316\u5f0f\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6f38\u5316\u5f0f<\/span><\/div>
\n

\u6570\u5217\u306b\u304a\u3051\u308b\u7b2c\\(n\\)\u9805\u3092\\(a_{n}\\)\u3001\u516c\u5dee\u3092d\u3068\u3059\u308b\u3068<\/p>\n\n\n\n

\\(a_{n+1}=a_{n}+d\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u6f38\u5316\u5f0f\u3068\u306f\u3001\u6570\u5217\u306e\u7b2c\\(n\\)\u9805\\(a_{n}\\)\u3092\u7528\u3044\u3066\u6b21\u306e\u9805\\(a_{n+1}\\)\u3092\u8868\u3059\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6f38\u5316\u5f0f\u306f\u3001\\(a_{n}\\)\u306b\u516c\u5deed\u3092\u52a0\u3048\u308b\u3068\\(a_{n+1}\\)\u306b\u306a\u308b\u3053\u3068\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u5b9f\u969b\u306b\u6570\u5b57\u3092\u5165\u308c\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

\n
\"\u7b49\u5dee\u6570\u5217\u306e\u4f8b\"<\/figure>\n<\/div>\n\n\n

<\/span><\/p>\n\n\n\n

\u3053\u308c\u306f\u521d\u98052\u3001\u516c\u5dee3\u306e\u7b49\u5dee\u6570\u5217\u3067\u3059\u3002<\/p>\n\n\n\n

\n

\u3064\u307e\u308a\u3001<\/p>\n\n\n\n

\\(a_{1}=2\\)<\/p>\n\n\n\n

\\(a_{2}=a_{1}+3\\)<\/p>\n\n\n\n

\\(a_{3}=a_{2}+3\\)<\/p>\n\n\n\n

\\(a_{4}=a_{3}+3\\)<\/p>\n\n\n\n

\u3068\u3044\u3046\u95a2\u4fc2\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n<\/div><\/div>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001\u7b2c\\((n+1)\\)\u9805\u3092\u8868\u3059\u3068\u304d\u306f\u7b2c\\(n\\)\u9805\u306b3\u3092\u52a0\u3048\u308c\u3070\u3088\u3044\u306e\u3067<\/p>\n\n\n\n

\\[a_{n+1}=a_{n}+3\\]<\/p>\n\n\n\n

\u3088\u3063\u3066\u3001\u7b49\u5dee\u6570\u5217\u306e\u6f38\u5316\u5f0f\u306f\u4ee5\u4e0b\u306e\u5f62\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\u30dd\u30a4\u30f3\u30c8<\/span><\/div>
\n

\u6570\u5217\u306b\u304a\u3051\u308b\u7b2c\\(n\\)\u9805\u3092\\(a_{n}\\)\u3001\u516c\u5dee\u3092d\u3068\u3059\u308b\u3068<\/p>\n\n\n\n

\\(a_{n+1}=a_{n}+d\\)<\/p>\n<\/div><\/div>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6027\u8cea<\/h2>\n\n\n\n

\u7b49\u5dee\u6570\u5217\u306e\u6027\u8cea\u306e1\u3064\u306b\u201d\u7b49\u5dee\u4e2d\u9805\u201d\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u7b49\u5dee\u4e2d\u9805<\/span><\/div>
\n

\u6570\u5217\\(a,b,c\\)\u304c\u7b49\u5dee\u6570\u5217\u306e\u3068\u304d\u3001<\/p>\n\n\n\n

\\[2b=a+c\\]<\/p>\n<\/div><\/div>\n\n\n\n

\u3053\u308c\u306f\u7b49\u5dee\u6570\u5217\u306e\u98053\u3064\u7528\u610f\u3057\u305f\u3068\u304d\u306b\u3001\u4e21\u7aef\u306e\u9805\u306e\u548c\u304c\u4e2d\u592e\u306e\u9805\u306e2\u500d\u306b\u306a\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u8a3c\u660e\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002\\(a,b,c\\)\u306f\u7b49\u5dee\u6570\u5217\u306a\u306e\u3067<\/p>\n\n\n\n

\\(b-a=c-b\\)<\/p>\n\n\n\n

\u5404\u9805\u3092\u79fb\u884c\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

\\(2b=a+c\\)<\/p>\n\n\n\n

\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u305d\u306e\u4ed6\u306e\u6570\u5217<\/h2>\n\n\n\n

\u4eca\u56de\u306f\u7b49\u5dee\u6570\u5217\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u6570\u5217\u306b\u306f\u7b49\u5dee\u6570\u5217\u4ee5\u5916\u306b\u3082\u4ee5\u4e0b\u306e\u6570\u5217\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\n
    \n
  • \u7b49\u6bd4\u6570\u5217<\/li>\n\n\n\n
  • \u968e\u5dee\u6570\u5217<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n

    \u30fb\u7b49\u6bd4\u6570\u5217<\/span><\/p>\n\n\n\n

    \u7b49\u6bd4\u6570\u5217\u3068\u306f\u3001\u300c\u521d\u3081\u306e\u9805\u306b\u4e00\u5b9a\u306e\u6570\u3092\u304b\u3051\u7d9a\u3051\u3066\u3044\u304f\u6570\u5217\u300d<\/span>\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n

    \n
    \"\u7b49\u6bd4\u6570\u5217\"<\/figure>\n<\/div>\n\n\n

    \u7b49\u6bd4\u6570\u5217\u306b\u3064\u3044\u3066\u306f\u3001\u300c\u7b49\u6bd4\u6570\u5217\u306e\u516c\u5f0f\u307e\u3068\u3081\uff01\u4e00\u822c\u9805\u3068\u548c\u306e\u516c\u5f0f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\uff01\u300d\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u30fb\u968e\u5dee\u6570\u5217<\/span><\/p>\n\n\n\n

    \u968e\u5dee\u6570\u5217\u306f\u8907\u96d1\u3067\u3001\u5404\u9805\u306e\u5dee\u3092\u66f8\u304d\u51fa\u3057\u3066\u307f\u308b\u3068\u3042\u308b\u6570\u5217\u304c\u898b\u3048\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n

    \n
    \"\u968e\u5dee\u6570\u5217\"<\/figure>\n<\/div>\n\n\n

    \u4e0a\u306e\u6570\u5217\u306e\u5834\u5408\u3001\u5404\u9805\u306e\u5dee\u304c\u7b49\u5dee\u6570\u5217\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

    \u3053\u306e\u5dee\u304c\u7b49\u6bd4\u6570\u5217\u306b\u306a\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3057\u3001\u3082\u3063\u3068\u8907\u96d1\u306a\u6570\u5217\u306b\u306a\u308b\u3068\u304d\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \u968e\u5dee\u6570\u5217\u306b\u3064\u3044\u3066\u306f\u3001\u300c\u968e\u5dee\u6570\u5217\u3092\u7528\u3044\u305f\u4e00\u822c\u9805\u3068\u548c\u3092\u6c42\u3081\u308b\u516c\u5f0f\uff01\u521d\u9805\u306b\u968e\u5dee\u3092\u8db3\u3057\u3066\u3044\u304f\u3060\u3051\u300d\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u300a\u7df4\u7fd2\u554f\u984c\u300b<\/h2>\n\n\n\n

    \u3053\u3053\u307e\u3067\u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805\u3084\u548c\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

    \u5b9f\u969b\u306b\u3001\u6570\u5b57\u3092\u3064\u304b\u3063\u3066\u7df4\u7fd2\u554f\u984c\u306b\u6311\u6226\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

    \u7df4\u7fd2\u554f\u984c1<\/span><\/div>
    \n

    \u6b21\u306e\u6570\u5217\u306e\u4e00\u822c\u9805\u3092\u6c42\u3081\u3088\u3046\u3002<\/p>\n\n\n\n

    5 , 9 , 13 , 17 , 21 , 25 \u2026<\/p>\n<\/div><\/div>\n\n\n\n

    \n
    \u89e3\u7b54<\/span><\/i><\/i><\/span><\/summary>
    \n

    \u4e0e\u3048\u3089\u308c\u305f\u6570\u5217\u306f\u300c\u521d\u98055\u3001\u516c\u5dee4\u306e\u7b49\u5dee\u6570\u5217\u300d\u3067\u3059\u3002<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u3001\u6c42\u3081\u308b\u4e00\u822c\u9805\u306f<\/p>\n\n\n\n

    \\begin{eqnarray}
    a_{n}&=&5+(n-1)4\\\\
    &=&4n+1
    \\end{eqnarray}<\/p>\n<\/div><\/details>\n<\/div>\n\n\n\n

    \u7df4\u7fd2\u554f\u984c2<\/span><\/div>
    \n

    \u7b49\u5dee\u6570\u5217\u306b\u304a\u3044\u3066\u3001\u521d\u9805\u304b\u3089<\/span>\u7b2c\\(n\\)\u9805\u307e\u3067\u306e\u548c\u3092\u6c42\u3081\u3088\u3046\u3002
    3\u30007\u300011\u300015\u300019\u300023\u3000…<\/p>\n<\/div><\/div>\n\n\n\n

    \n
    \u89e3\u7b54<\/span><\/i><\/i><\/span><\/summary>
    \n

    \u3053\u308c\u306f\u300c\u521d\u98053\u3001\u516c\u5dee4\u3001\u9805\u6570n\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u300d\u3067\u3059\u3002<\/p>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u306e\u548c\u306e\u516c\u5f0f\u306b\u4ee3\u5165\u3057\u3066<\/p>\n\n\n\n

    \\begin{eqnarray}
    \\displaystyle S_{n} &=&\\frac{n}{2}\\{2a_{1}+(n-1)d\\}\\\\
    \\displaystyle &=&\\frac{n}{2}\\{2 \\cdot 3+4(n-1)\\}\\\\
    \\displaystyle &=&\\frac{n}{2}(4n+2)\\\\
    &=&2n^{2}+n
    \\end{eqnarray}<\/p>\n\n\n\n

    \u3057\u305f\u304c\u3063\u3066\u3001\u6c42\u3081\u308b\u548c\u306f<\/p>\n\n\n\n

    \\(S_{n}=2n^{2}+n\\)<\/p>\n<\/div><\/details>\n<\/div>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n

    \u4eca\u56de\u306f\u7b49\u5dee\u6570\u5217\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u3068\u306f
    <\/span>\u21d2\u4e00\u5b9a\u306e\u5dee\u3067\u5909\u5316\u3059\u308b\u6570\u5217<\/p>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u306e\u4e00\u822c\u9805<\/span><\/div>
    \n

    \u521d\u9805\\(a_{1}\\)\u3001\u516c\u5dee\\(d\\)\u306e\u7b49\u5dee\u6570\u5217\u3092\\(\\{a_{n}\\}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

    \\(a_{n}=a_{1} + (n-1)d\\)<\/p>\n<\/div><\/div>\n\n\n\n

    \u7b49\u5dee\u6570\u5217\u306e\u548c<\/span><\/div>
    \n

    \u521d\u9805\\(a\\)\u3001\u516c\u5dee\\(d\\)\u3001\u672b\u9805\\(l\\)\u3001\u9805\u6570\\(n\\)\u306e\u7b49\u5dee\u6570\u5217\u306e\u548c\u3092\\(S_{n}\\)\u3068\u3059\u308b\u3068\u3001<\/p>\n\n\n\n

    \\begin{eqnarray}
    \\displaystyle S_{n}&=&\\frac{n}{2}(a+l)\\\\
    \\displaystyle &=&\\frac{n}{2}\\{2a+(n-1)d\\}
    \\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n

    \u4eca\u56de\u306f\u7b49\u5dee\u6570\u5217\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u304c\u3001\u7b49\u6bd4\u6570\u5217\u3084\u968e\u5dee\u6570\u5217\u3082\u91cd\u8981\u306a\u6570\u5217<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n

    \u3053\u306e3\u3064\u306e\u6570\u5217\u3092\u3057\u3063\u304b\u308a\u3068\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u3068\u3001\u6f38\u5316\u5f0f\u3084\u7fa4\u6570\u5217\u3067\u304b\u306a\u308a\u82e6\u6226\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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