{"id":8754,"date":"2026-03-06T17:06:52","date_gmt":"2026-03-06T08:06:52","guid":{"rendered":"https:\/\/torisetudy.com\/?p=8754"},"modified":"2026-03-07T09:52:39","modified_gmt":"2026-03-07T00:52:39","slug":"%e8%bf%91%e4%bc%bc%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/torisetudy.com\/?p=8754","title":{"rendered":"\u8fd1\u4f3c\u5f0f\u306e\u57fa\u672c"},"content":{"rendered":"\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#i\"><span class=\"toc_number toc_depth_1\">1<\/span> \u5411\u304d\u5408\u3044\u65b9<\/a><\/li><li><a href=\"#i-2\"><span class=\"toc_number toc_depth_1\">2<\/span> \u8fd1\u4f3c\u306e\u65b9\u6cd5<\/a><\/li><li><a href=\"#1xn\"><span class=\"toc_number toc_depth_1\">3<\/span> $(1+x)^n$ \u306e\u5f62\u306e\u8fd1\u4f3c<\/a><\/li><li><a href=\"#i-3\"><span class=\"toc_number toc_depth_1\">4<\/span> \u4e09\u89d2\u95a2\u6570\u306e\u8fd1\u4f3c<\/a><\/li><li><a href=\"#i-4\"><span class=\"toc_number toc_depth_1\">5<\/span> \u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2 class=\"wp-block-heading\"><span id=\"i\">\u5411\u304d\u5408\u3044\u65b9<\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u5965\u306f\u6df1\u3044\u3051\u3069\u3002<\/h3>\n\n\n\n<p>\u7269\u7406\u306e\u554f\u984c\u3092\u89e3\u3044\u3066\u3044\u308b\u3068\uff0c\u6642\u6298\u51fa\u3066\u304f\u308b\u8fd1\u4f3c\u306e\u8a71\u3002\u3061\u3083\u3093\u3068\u7406\u89e3\u3057\u3088\u3046\u3068\u601d\u3046\u3068\u5965\u304c\u6df1\u3044\u306e\u3067\u3059\u304c\uff0c\u5165\u8a66\u554f\u984c\u3092\u8003\u3048\u308b\u3046\u3048\u3067\u306f\u3044\u304f\u3064\u304b\u306e\u4ee3\u8868\u4f8b\u3068\u539f\u5247\u3092\u62bc\u3055\u3048\u3066\u304a\u3051\u3070\u5145\u5206\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u300c\u305d\u3046\u3044\u3046\u3082\u3093\u3060\u300d\u3068\u5272\u308a\u5207\u308b\u306e\u3082\u5927\u5207\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u3044\u3064\u8003\u3048\u308b\uff1f<\/h3>\n\n\n\n<p>\u5165\u8a66\u554f\u984c\u3067\u8fd1\u4f3c\u3092\u7528\u3044\u3066\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\uff0c<span class=\"st-mymarker-s-b\">\u300c\u305f\u3060\u3057\uff0c$|x|\\ll1$ \u3068\u3059\u308b\u3002\u300d<\/span>\u306e\u3088\u3046\u306a\u300c\u8fd1\u4f3c\u3092\u8003\u3048\u3066\u306d\uff01\uff01\u300d\u3068\u3044\u3046\u4e00\u6587\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u300c$x$ \u3092\u5fae\u5c0f\u91cf\u3068\u307f\u306a\u3057\u3066\uff0c\u8fd1\u4f3c\u3092\u3057\u3066\u306d\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3002<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u3053\u308c\u3092\u898b\u305f\u3089\u8fd1\u4f3c\u3092\u8003\u3048\u308b\u3002\u9006\u306b\uff0c\u4f55\u304c\u5fae\u5c0f\u91cf\u304b\u4e0e\u3048\u3089\u308c\u3066\u3044\u306a\u3044\u306e\u306b\u81ea\u5206\u3067\u30a4\u30c1\u304b\u3089\u8fd1\u4f3c\u3092\u8003\u3048\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3053\u3068\u306f\u7a00\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>\u3053\u306e\u4e00\u6587\u3092\u307f\u305f\u3089\uff0c\u300c$x$ \u304c\u5fae\u5c0f\u91cf\u306a\u3093\u3060\u306a\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u5f37\u304f\u610f\u8b58\u3057\u3066\u304f\u3060\u3055\u3044\u3002$x\\ll L$ \u306e\u3088\u3046\u306a\u6761\u4ef6\u306e\u5834\u5408\u306b\u306f\uff0c$\\bun{x}{L}\\ll1$ \u3068\u5909\u5f62\u3057\u3066\uff0c$\\bun{x}{L}$ \u3092\u5fae\u5c0f\u91cf\u3068\u3057\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\uff0c<span class=\"st-mymarker-s\">\u300c\u4f55\u304c\u5fae\u5c0f\u91cf\u304b\u3092\u78ba\u8a8d\u3059\u308b\u300d<\/span>\u306e\u304c\u6700\u521d\u306e\u4e00\u6b69\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"i-2\">\u8fd1\u4f3c\u306e\u65b9\u6cd5<\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u3069\u3046\u3084\u3063\u3066\u8fd1\u4f3c\u3059\u308b\u304b<\/h3>\n\n\n\n<p>\u4f7f\u3046\u8fd1\u4f3c\u306e\u5f0f\u306f\u554f\u984c\u6587\u3067\u4e0e\u3048\u3089\u308c\u308b\u3053\u3068\u304c\u5927\u534a\u3067\u3059\u3002\u305f\u3068\u3048\u3070\uff0c\u300c\u5fae\u5c0f\u91cf $x$ \u306b\u5bfe\u3057\u3066\uff0c$\\sqrt{1+x}\\fallingdotseq1+\\bun12x$ \u304c\u6210\u308a\u7acb\u3064\u3082\u306e\u3068\u3057\u3066\u3088\u3044\u3002\u300d\u306a\u3069\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u8fd1\u4f3c\u5f0f\u304c\u4e0e\u3048\u3089\u308c\u305f\u3089\uff0c\u300c$\\sqrt{1+x}$ \u306e\u5f62\u3092\u4f55\u304c\u4f55\u3067\u3082\u4f5c\u308b\uff01\uff01\u300d\u3068\u3044\u3046\u76ee\u7684\u610f\u8b58\u3092\u6301\u3063\u3066\u5f0f\u5909\u5f62\u3092\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u306a\u3093\u3068\u306a\u304f\u5f0f\u5909\u5f62\u3057\u3066\u3044\u3066\u3082\u89e3\u3051\u307e\u305b\u3093\u3002\u4e0e\u3048\u3089\u308c\u305f\u5f62\u3092\u4f5c\u308a\u51fa\u305d\u3046\uff0c\u3068\u3044\u3046\u610f\u8b58\u304c\u4f55\u3088\u308a\u91cd\u8981\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\uff0c<span class=\"st-mymarker-s\">\u300c\u4e0e\u3048\u3089\u308c\u305f\u5f62\u3092\u76ee\u6307\u3057\u3066\u5f0f\u5909\u5f62\u3057\u3066\u3044\u304f\u300d<\/span>\u3068\u3044\u3046\u65b9\u91dd\u3067\u8003\u3048\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u3068\u304d\uff0c\u6700\u521d\u306b\u78ba\u8a8d\u3057\u305f\u300c\u4f55\u304c\u5fae\u5c0f\u91cf\u304b\u300d\u3082\u5fd8\u308c\u305a\u306b\u610f\u8b58\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n    <div class=\"wp-block-st-blocks-point-box st-point-box has-title post-hashiro-point\" style=\"\n        background-color:#fff; \n        border: 2px solid #ff7f50; \n        padding: 0px 18px; \n        border-radius: 4pt; \n        position: relative;\">\n        \n        <p class=\"st-mybox-title\" style=\"\n            position: absolute; \n            top: -12px; \n            left: 12px; \n            background-color: #fff; \n            padding: 0 10px; \n            color: #ff7f50; \n            font-weight: bold; \n            font-size: 15px; \n            line-height: 1.5; \n            text-decoration: none;\n            margin-bottom: 20px; \n            display: flex; \n            align-items: center; \n            gap: 5px;\">\n            <i class=\"st-fa st-svg-lightbulb-o st-css-no\" aria-hidden=\"true\"><\/i> \u8fd1\u4f3c\u306e\u8003\u3048\u65b9\n        <\/p>\n\n        <div class=\"st-in-point-box\" style=\"\n            margin-top: 0px; \n            margin-bottom: 0px;\n            padding-top: 0px;\n            padding-bottom: 30px;\">\n            <p style=\"margin-bottom: -10px !important;\">\u300c\u4f55\u304c\u5fae\u5c0f\u91cf\u304b\u300d\u3092\u610f\u8b58\u3057\u3066\uff0c\u300c\u4f5c\u308b\u5f0f\u306e\u5f62\u3092\u76ee\u6307\u3057\u3066\u300d\u5f0f\u5909\u5f62\u3092\u9032\u3081\u308b\u3002<\/p>\n        <\/div>\n    <\/div>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u3088\u304f\u3042\u308b\u5f62\u306e\u8fd1\u4f3c\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"1xn\">$(1+x)^n$ \u306e\u5f62\u306e\u8fd1\u4f3c<\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u3059\u308b\u5f0f<\/h3>\n\n\n\n<p>$|x|\\ll1$ \u306e\u3068\u304d\uff0c\u4ee5\u4e0b\u306e\u8fd1\u4f3c\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n    <div class=\"wp-block-st-blocks-point-box st-point-box has-title post-hashiro-point\" style=\"\n        background-color:#fff; \n        border: 2px solid #ff7f50; \n        padding: 0px 18px; \n        border-radius: 4pt; \n        position: relative;\">\n        \n        <p class=\"st-mybox-title\" style=\"\n            position: absolute; \n            top: -12px; \n            left: 12px; \n            background-color: #fff; \n            padding: 0 10px; \n            color: #ff7f50; \n            font-weight: bold; \n            font-size: 15px; \n            line-height: 1.5; \n            text-decoration: none;\n            margin-bottom: 20px; \n            display: flex; \n            align-items: center; \n            gap: 5px;\">\n            <i class=\"st-fa st-svg-lightbulb-o st-css-no\" aria-hidden=\"true\"><\/i> \u3088\u304f\u3042\u308b\u8fd1\u4f3c\u2460\n        <\/p>\n\n        <div class=\"st-in-point-box\" style=\"\n            margin-top: 0px; \n            margin-bottom: 0px;\n            padding-top: 0px;\n            padding-bottom: 30px;\">\n            <p style=\"margin-bottom: -10px !important;\">$|x|\\ll1$ \u306e\u3068\u304d\uff0c<\/p><p style=\"margin-bottom: -10px !important;\">$$(1+x)^n\\fallingdotseq 1+nx$$<\/p>\n        <\/div>\n    <\/div>\n\n\n\n<p>\u3053\u306e\u3068\u304d\uff0c$1+x$ \u3068\u3044\u3046\u5f62\u304c\u3042\u308a\u307e\u3059\u306e\u3067\uff0c$x$ \u306f\u6b21\u5143\u306e\u306a\u3044\u7269\u7406\u91cf\u3068\u306a\u308b\u3053\u3068\u306b\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u305f\u3068\u3048\u3070 $l$ \u3084 $d$ \u304c\u9577\u3055\u3092\u8868\u3059\u3068\u304d\uff0c$(1+l)^2$ \u3068\u3044\u3063\u305f\u5f62\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002$\\left(1+\\bun{d}{l}\\right)^n$ \u306e\u3088\u3046\u306a\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6700\u3082\u3088\u304f\u3042\u308b\u306e\u306f\uff0c$n=\\bun12$ \u306e\u5834\u5408\u3067\u3059\u3002<\/p>\n\n\n\n<p>$$\\sqrt{1+x}\\fallingdotseq 1+\\bun{x}{2}$$<\/p>\n\n\n\n<p>\u3068\u306a\u308b\u305f\u3081\uff0c\u898b\u305f\u76ee\u306f\u5c11\u3057\u7570\u306a\u3063\u305f\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002<\/p>\n\n\n\n    <div class=\"wp-block-st-blocks-midashi-box freebox has-title post-hashiro-reidai\" style=\"\n        background-color:#f7f7fb; \n        border-width: 3px; \n        border-color:#a3bded;\">\n        \n        <p class=\"p-free\" style=\"\n            border-color:#a3bded; \n            font-weight: bold;\">\n            <span class=\"p-entry-f\" style=\"\n                color:#ffffff; \n                font-weight: bold; \n                background-color:#a3bded;\">\n                <i class=\"st-fa st-svg-pencil st-css-no\" aria-hidden=\"true\"><\/i> \u4f8b\u984c\n            <\/span>\n        <\/p>\n\n        <div class=\"free-inbox\" style=\"\n            margin-top: 0px; \n            margin-bottom: 0px;\n            padding: 10px 15px;\">\n            <p>\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u306b\u304a\u3044\u3066\uff0c\u8907\u30b9\u30ea\u30c3\u30c8\u3092\u901a\u3063\u3066\u30b9\u30af\u30ea\u30fc\u30f3\u4e0a\u306e\u4f4d\u7f6e $x$ \u306b\u5230\u9054\u3059\u308b2\u3064\u306e\u5149\u306e\u5149\u8def\u5dee\u3092\u6c42\u3081\u3088\u3002\u305f\u3060\u3057\uff0c\u8907\u30b9\u30ea\u30c3\u30c8\u306e\u30b9\u30ea\u30c3\u30c8\u9593\u306e\u8ddd\u96e2\u3092 $d$\uff0c\u8907\u30b9\u30ea\u30c3\u30c8\u3068\u30b9\u30af\u30ea\u30fc\u30f3\u306e\u8ddd\u96e2\u3092 $l$ \u3068\u3057\uff0c$x,\\,d\\ll l$ \u304c\u6210\u308a\u7acb\u3064\u3082\u306e\u3068\u3059\u308b\u3002<\/p><p><figure class=\"wp-block-image size-large physicsimg\"><img decoding=\"async\" width=\"160\" height=\"138\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u7269\u7406750.svg\" alt=\"\u7269\u7406750\" class=\"wp-image-5904\"\/><noscript><img decoding=\"async\" width=\"160\" height=\"138\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u7269\u7406750.svg\" alt=\"\u7269\u7406750\" class=\"wp-image-5904\"\/><\/noscript><\/figure><\/p>\n        <\/div>\n    <\/div>\n\n\n\n<p>\u3088\u304f\u3042\u308b\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u306e\u4f8b\u3067\u3059\u3002\u7d50\u8ad6\u306f\u899a\u3048\u3066\u3044\u308b\u4eba\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002\u5c0e\u51fa\u306b\u3064\u3044\u3066\u3057\u3063\u304b\u308a\u3068\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u307e\u305a\uff0c\u30b9\u30af\u30ea\u30fc\u30f3\u4e0a\u306b\u4e0b\u308d\u3057\u305f\u5782\u7dda\u306e\u8db3\u3092\u305d\u308c\u305e\u308c $\\rmH_1$ \uff0c$\\rmH_2$ \u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n<figure class=\"wp-block-image size-large physicsimg\"><img decoding=\"async\" width=\"171\" height=\"159\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u7269\u7406751.svg\" alt=\"\u7269\u7406751\" class=\"wp-image-5905\"\/><noscript><img decoding=\"async\" width=\"171\" height=\"159\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u7269\u7406751.svg\" alt=\"\u7269\u7406751\" class=\"wp-image-5905\"\/><\/noscript><\/figure>\n\n\n\n<p>\u3053\u306e\u3068\u304d\uff0c$\\rmS_2\\rmA$ \u306f $\\triangle\\rmA\\rm\\rmS_2\\rmH_2$ \u306e\u659c\u8fba\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u56f3\u304b\u3089\uff0c$\\overline{\\rmA\\rmH_2}=x+\\Bun{d}{2}$ \u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u306e\u3067\uff0c\u4e09\u5e73\u65b9\u306e\u5b9a\u7406\u304b\u3089\uff0c<\/p>\n\n\n\n<p>$$\\overline{\\rmS_2\\rmA}=\\left\\{l^2+\\left(x+\\bun{d}{2}\\right)^2\\right\\}^{\\frac12}$$<\/p>\n\n\n\n<p>\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u76ee\u6a19\u306e\u5f62\u306f $(1+\\stext{(\u5fae\u5c0f\u91cf)})^n$ \u306e\u5f62\u3067\u3059\u3002\u3067\u306f\u305f\u3068\u3048\u3070\uff0c$\\left(x+\\bun{d}{2}\\right)^2$ \u306e\u90e8\u5206\u306b\u3064\u3044\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u90e8\u5206\u3092\u8fd1\u4f3c\u304c\u4f7f\u3048\u308b\u5f62\u306b\u5909\u5f62\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u304b\u2026\uff1f<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u4f55\u304c\u5fae\u5c0f\u91cf\u306b\u306a\u308b\u304b\u3092\u610f\u8b58\u3059\u308b\u3068\u2026\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<p>\u4eca\u56de\uff0c$d,\\,x\\ll l$ \u3068\u3044\u3046\u6761\u4ef6\u3067\u3059\u306e\u3067\uff0c\u5fae\u5c0f\u91cf\u306f $\\bun{d}{l}$ \u3084 $\\bun{x}{l}$ \u3067\u3059\u3002$\\left(x+\\bun{d}{2}\\right)^2$ \u306e\u5f0f\u306b\u3064\u3044\u3066\uff0c$x$ \u3068 $\\bun{d}{2}$ \u306e\u5927\u304d\u3055\u306b\u3064\u3044\u3066\u660e\u78ba\u306a\u5927\u5c0f\u95a2\u4fc2\u304c\u3042\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\uff0c$(1+\\stext{(\u5fae\u5c0f\u91cf)})^n$ \u306e\u5f62\u306b\u5909\u5f62\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3067\uff0c$\\overline{\\rmS_2\\rmA}=\\left\\{l^2+\\left(x+\\bun{d}{2}\\right)^2\\right\\}^{\\frac12}$ \u306e\u5168\u4f53\u3092\u307f\u308b\u3068\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002$l^2$ \u306b\u6bd4\u3079\u3066\uff0c$\\left(x+\\bun{d}{2}\\right)^2$ \u306f\u975e\u5e38\u306b\u5c0f\u3055\u3044\u5024\u3067\u3059\u3002\u3064\u307e\u308a\uff0c<\/p>\n\n\n\n<p>$$\\left(\\stext{\uff08\u975e\u5e38\u306b\u5927\u304d\u306a\u5024\uff09}+\\stext{\uff08\u975e\u5e38\u306b\u5c0f\u3055\u306a\u5024\uff09}\\right)^2$$<\/p>\n\n\n\n<p>\u3068\u3044\u3046\u5f62\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3068\u304d\uff0c \uff08\u975e\u5e38\u306b\u5927\u304d\u306a\u5024\uff09\u3092\u304b\u3063\u3053\u306e\u5916\u306b\u51fa\u3059\u3053\u3068\u3067\uff0c$(1+\\stext{(\u5fae\u5c0f\u91cf)})^n$ \u306e\u5f62\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002$l^2$ \u3092\u304b\u3063\u3053\u306e\u5916\u306b\u51fa\u3059\u3088\u3046\u306b\u5909\u5f62\u3059\u308b\u3068\uff0c<\/p>\n\n\n\n<p>$$\\begin{aligned}\\left\\{l^2+\\left(x+\\bun{d}{2}\\right)^2\\right\\}^{\\frac12}&amp;=l\\left\\{1+\\left(\\bun{x+d\/2}{l}\\right)^2\\right\\}^{\\frac12}\\end{aligned}$$<\/p>\n\n\n\n<p>\u3067\u3059\u3002$x+\\bun{d}{2}\\ll l$ \u3067\u3059\u306e\u3067\uff0c\u3061\u3083\u3093\u3068 $(1+\\stext{(\u5fae\u5c0f\u91cf)})^n$ \u306e\u5f62\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u3088\u3063\u3066\u3053\u306e\u5f62\u306b\u8fd1\u4f3c\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\uff0c<\/p>\n\n\n\n<p>$$\\begin{aligned}l\\left\\{1+\\left(\\bun{x+d\/2}{l}\\right)^2\\right\\}^{\\frac12}&amp;\\fallingdotseq l\\left\\{1+\\bun12\\left(\\bun{x+d\/2}{l}\\right)^2\\right\\}\\end{aligned}$$<\/p>\n\n\n\n<p>\u3068\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>$\\overline{\\rmS_1\\rmA}$ \u306b\u3064\u3044\u3066\u306f\uff0c\u4e0a\u306e\u5f0f\u4e2d\u3067 $x+\\bun{d}{2}\\to x-\\bun{d}{2}$ \u3068\u5909\u63db\u3059\u308b\u3060\u3051\u3067\u3059\u306e\u3067\uff0c<\/p>\n\n\n\n<p>$$\\overline{\\rmS_1\\rmA}\\fallingdotseq l\\left\\{1+\\bun12\\left(\\bun{x-d\/2}{l}\\right)^2\\right\\}$$<\/p>\n\n\n\n<p>\u3067\u3059\u3002\u3042\u3068\u306f\u9811\u5f35\u3063\u3066\u5c55\u958b\u3057\u3066\u8a08\u7b97\u3059\u308b\u3060\u3051\u3002<\/p>\n\n\n\n<p>$$\\overline{\\rmS_2\\rmA}-\\overline{\\rmS_1\\rmA}=d\\bun{x}{l}$$<\/p>\n\n\n\n<p>\u3068\u3044\u3046\u5f0f\u304c\u5c0e\u304b\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u306e\u78ba\u8a8d\u3082\u3064\u3044\u3067\u306b\uff01<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n    <div class=\"pretty-card\">\n      <div class=\"pretty-card-thumb\">\n        <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u2460-1024x538.png\" alt=\"\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u2460\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u2460-1024x538.png\" alt=\"\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u2460\"><\/noscript>\n      <\/div>\n      <div class=\"pretty-card-content\">\n        <div class=\"pretty-card-title\">\u30e4\u30f3\u30b0\u306e\u5b9f\u9a13\u2460<\/div>\n        <div class=\"pretty-card-excerpt\">\u76ee\u6b211 \u6c34\u9762\u6ce2\u306e\u5e72\u6e09\u3068\u306e\u9055\u30442 \u30e4\u30f3\u30b0\u306e\u5b9f\u9a133 (1) \u4e09\u5e73\u65b9\u306e\u5b9a\u7406\u3067\u8a08\u7b97\u3059\u308b\u65b9\u6cd54 (2) \u8907\u30b9\u30ea\u30c3\u30c8\u4ed8\u8fd1\u306e\u69d8\u5b50\u306b\u6ce8\u76ee\u3059\u308b\u65b9\u6cd55 \u5e72\u6e09\u6761\u4ef6 \u6c34\u9762\u6ce2\u306e\u5e72\u6e09\u3068\u306e\u9055\u3044 \u30b9\u30b1\u30fc\u30eb\u306e\u9055\u3044 \u4ee5\u524d\u5b66\u7fd2\u3057\u305f\u6c34\u9762\u6ce2\u306e ... <\/div>\n        <a class=\"pretty-card-button\" href=\"https:\/\/torisetudy.com\/?p=6278\">\u8a73\u3057\u304f\u898b\u308b<\/a>\n      <\/div>\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"i-3\">\u4e09\u89d2\u95a2\u6570\u306e\u8fd1\u4f3c<\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u3059\u308b\u5f0f<\/h3>\n\n\n\n<p>$|x|\\ll1$ \u306e\u3068\u304d\uff0c\u4ee5\u4e0b\u306e\u8fd1\u4f3c\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n    <div class=\"wp-block-st-blocks-point-box st-point-box has-title post-hashiro-point\" style=\"\n        background-color:#fff; \n        border: 2px solid #ff7f50; \n        padding: 0px 18px; \n        border-radius: 4pt; \n        position: relative;\">\n        \n        <p class=\"st-mybox-title\" style=\"\n            position: absolute; \n            top: -12px; \n            left: 12px; \n            background-color: #fff; \n            padding: 0 10px; \n            color: #ff7f50; \n            font-weight: bold; \n            font-size: 15px; \n            line-height: 1.5; \n            text-decoration: none;\n            margin-bottom: 20px; \n            display: flex; \n            align-items: center; \n            gap: 5px;\">\n            <i class=\"st-fa st-svg-lightbulb-o st-css-no\" aria-hidden=\"true\"><\/i> \u3088\u304f\u3042\u308b\u8fd1\u4f3c\u2461\n        <\/p>\n\n        <div class=\"st-in-point-box\" style=\"\n            margin-top: 0px; \n            margin-bottom: 0px;\n            padding-top: 0px;\n            padding-bottom: 30px;\">\n            <p style=\"margin-bottom: -10px !important;\">$|x|\\ll1$ \u306e\u3068\u304d\uff0c<\/p><p style=\"margin-bottom: -10px !important;\">$$\\sin x\\fallingdotseq \\tan x\\fallingdotseq x,\\ \\cos x\\fallingdotseq 1$$<\/p>\n        <\/div>\n    <\/div>\n\n\n\n<p>$\\cos x\\fallingdotseq 1$ \u306e\u5f0f\u3088\u308a\u3082\uff0c<\/p>\n\n\n\n<p>$$\\sin x\\fallingdotseq \\tan x\\fallingdotseq x$$<\/p>\n\n\n\n<p>\u306e\u307b\u3046\u304c\u983b\u51fa\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"st-kaiwa-box kaiwaicon1 clearfix\"><div class=\"st-kaiwa-face\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><noscript><img decoding=\"async\" src=\"https:\/\/torisetudy.com\/wp-content\/uploads\/2022\/07\/\u5b8c\u6210\u30a2\u30a4\u30b3\u30f3.png\" width=\"60px\"><\/noscript><div class=\"st-kaiwa-face-name\">\u7fbd\u767d<\/div><\/div><div class=\"st-kaiwa-area\"><div class=\"st-kaiwa-hukidashi\"><div class=\"wp-block-st-blocks-st-kaiwa\">\n<p>\u3053\u3061\u3089\u306e\u8fd1\u4f3c\u306f\u5f0f\u5909\u5f62\u306e\u65b9\u91dd\u3067\u8a70\u307e\u308b\u3053\u3068\u306f\u5c11\u306a\u3044\u3088\u3046\u306b\u601d\u3044\u307e\u3059\u3002<\/p>\n<\/div><\/div><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"i-4\">\u307e\u3068\u3081<\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u5f0f<\/h3>\n\n\n\n<p>\u7d39\u4ecb\u3057\u305f2\u7a2e\u985e\u306e\u8fd1\u4f3c\u306f\u983b\u51fa\u3067\u3059\u3002\u3069\u3061\u3089\u3082\u30b9\u30e0\u30fc\u30ba\u306b\u5f0f\u5909\u5f62\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n    <div class=\"wp-block-st-blocks-point-box st-point-box has-title post-hashiro-point\" style=\"\n        background-color:#fff; \n        border: 2px solid #ff7f50; \n        padding: 0px 18px; \n        border-radius: 4pt; \n        position: relative;\">\n        \n        <p class=\"st-mybox-title\" style=\"\n            position: absolute; \n            top: -12px; \n            left: 12px; \n            background-color: #fff; \n            padding: 0 10px; \n            color: #ff7f50; \n            font-weight: bold; \n            font-size: 15px; \n            line-height: 1.5; \n            text-decoration: none;\n            margin-bottom: 20px; \n            display: flex; \n            align-items: center; \n            gap: 5px;\">\n            <i class=\"st-fa st-svg-lightbulb-o st-css-no\" aria-hidden=\"true\"><\/i> \u3088\u304f\u4f7f\u3046\u8fd1\u4f3c\n        <\/p>\n\n        <div class=\"st-in-point-box\" style=\"\n            margin-top: 0px; \n            margin-bottom: 0px;\n            padding-top: 0px;\n            padding-bottom: 30px;\">\n            <p style=\"margin-bottom: -10px !important;\">$|x|\\ll1$ \u306e\u3068\u304d\uff0c<\/p><p style=\"margin-bottom: -10px !important;\">$$(1+x)^n\\fallingdotseq 1+nx,\\ \\sin x\\fallingdotseq \\tan x\\fallingdotseq x,\\ \\cos x\\fallingdotseq 1$$<\/p>\n        <\/div>\n    <\/div>\n\n\n\n<p>\u5b9f\u6226\u3067\u306f\uff0c<span 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