\u4e00\u898b\u3059\u308b\u3068\u3053\u306e\u7a4d\u5206\u306f \\( \\sqrt{(x+3)^{2}-12x} \\) \u3068\u3044\u3046\u591a\u5c11\u30c9\u30ad\u30c3\u3068\u3059\u308b\u5f62\u3092\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u8a08\u7b97\u3092\u9032\u3081\u308b\u3046\u3061\u306b<\/p>\n
$$\\sqrt{(x+3)^{2}-12x}=\\sqrt{(x^{2}+6x+9)-12x}$$<\/p>\n
$$=\\sqrt{x^{2}-6x+9}$$<\/p>\n
$$=\\sqrt{(x-3)^{2}}$$<\/p>\n
\u306e\u3088\u3046\u306b\u306a\u308b\u3053\u3068\u306b\u6c17\u304c\u3064\u304f\u3068\u601d\u3044\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u3053\u306e\u7a4d\u5206\u3092<\/p>\n
$$\\displaystyle\\int_{0}^{4}(x-3)\\,dx$$<\/p>\n
\u3068\u5909\u5f62\u3057\u3066\u8a08\u7b97\u3059\u308b\u3068\u3053\u306e\u6bb5\u968e\u3067\u8aa4\u308a\u304c\u767a\u751f\u3057\u307e\u3059\u3002
\n\u5b9f\u306f\u3001\u3053\u306e\u7a4d\u5206\u306e\u51fa\u984c\u610f\u56f3\u306f\u300c\u7a4d\u5206\u304c\u3067\u304d\u308b\u304b\u300d\u3067\u306f\u306a\u304f\u3001
\n$$\\sqrt{(x-3)^{2}}=|x-3|$$
\n\u3068\u5909\u5f62\u3067\u304d\u308b\u304b\u3068\u3044\u3046\u3053\u3068\u3060\u3063\u305f\u306e\u3067\u3059\u3002\u3053\u308c\u3092\u76f4\u63a5\u00a0 \\(\\sqrt{(x-3)^{2}}\\) \u00a0\u306e\u5f62\u3067\u554f\u3046\u3068\u89e3\u304f\u4eba\u306f\u8b66\u6212\u3059\u308b\u304b\u610f\u56f3\u304c\u308f\u304b\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3082\u3061\u308d\u3093\u3001\u305d\u3053\u3067\u6b63\u3057\u304f\u5909\u5f62\u3067\u304d\u308b\u3053\u3068\u306f\u5927\u5207\u3067\u3059\u304c\u3001
\n\u300c\\(\\sqrt{(x+3)^{2}-12x}=\\sqrt{(x-3)^{2}}\\) \u3068\u306a\u308b\u3053\u3068\u304c\u308f\u304b\u3063\u305f!\u300d
\n\u3068\u3044\u3046\u3053\u3068\u3067\u307b\u3063\u3068\u3057\u3066\u6c17\u304c\u7de9\u3093\u3060?\u72b6\u6cc1\u3067\u3082\u3053\u306e\u5148\u6b63\u3057\u3044\u8a08\u7b97\u304c\u3067\u304d\u308b\u3053\u3068\u304c\u771f\u306b\u8a08\u7b97\u304c\u8eab\u306b\u4ed8\u3044\u3066\u3044\u308b\u3068\u8a00\u3048\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u6570\u5b66\u306e\u7406\u89e3\u306b\u3064\u3044\u3066\u6b21\u306e\u3088\u3046\u306b\u5206\u3051\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002
\n\u7b2c1\u6c34\u6e96: \u6ce8\u610f\u3057\u3066\u89e3\u3051\u3070\u6b63\u3057\u304f\u89e3\u3051\u308b
\n\u7b2c2\u6c34\u6e96: \u7279\u306b\u610f\u8b58\u3057\u306a\u304f\u3066\u3082\u9593\u9055\u308f\u305a\u306b\u89e3\u3051\u308b<\/p>\n
\u4f8b\u3048\u3070\u3001
\n\u300c\\(\\mbox{AB}=4\\), \\( \\mbox{BC}=5\\),\u00a0\u00a0\\(\\mbox{CA}=6\\) \u306e\u3068\u304d \\(\\cos \\angle\\mbox{ABC}\\) \u3092\u6c42\u3081\u3088\u3002\u300d
\n\u3068\u3044\u3046\u554f\u984c\u306b\u5bfe\u3057\u3001\u3053\u308c\u306f 3 \u8fba\u306e\u9577\u3055\u304c\u4e0e\u3048\u3089\u308c\u3066\u3044\u308b\u304b\u3089\u4f59\u5f26\u5b9a\u7406\u3092\u4f7f\u3046\u554f\u984c\u3060\u3068\u8003\u3048\u3066\u89e3\u304f\u306e\u306f\u7b2c1\u6c34\u6e96\u30ec\u30d9\u30eb\u3001\u7279\u306b\u4f59\u5f26\u5b9a\u7406\u3068\u610f\u8b58\u3057\u306a\u304f\u3066\u3082\u6c42\u3081\u3066\u3057\u307e\u3046\u306e\u304c\u7b2c2\u6c34\u6e96\u30ec\u30d9\u30eb\u3067\u3059\u3002
\n\u3042\u308b\u7a0b\u5ea6\u96e3\u3057\u3044\u554f\u984c\u3092\u89e3\u304f\u305f\u3081\u306b\u306f\u3001\u7b2c2\u6c34\u6e96\u30ec\u30d9\u30eb\u306e\u7406\u89e3\u3092\u3057\u3066\u3044\u308b\u3082\u306e\u3092\u5897\u3084\u3059\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n
\u5b9a\u7a4d\u5206\u306e\u8a08\u7b97\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\\(\\displaystyle\\int_{0}^{4}\\sqrt{(x+3)^{2}-12x}\\,dx=\\displaystyle\\int_{0}^{4}\\sqrt{(x-3)^{2}}\\,dx\\)
\n\\(=\\displaystyle\\int_{0}^{4}\\,|x-3|\\,dx\\)
\n\\(=\\displaystyle\\int_{0}^{3}\\{ -(x-3)\\}\\,dx+\\displaystyle\\int_{3}^{4}(x-3)\\,dx\\)
\n\\(=\\cdots\\)
\n\\(=5\\)<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u898b\u3059\u308b\u3068\u3053\u306e\u7a4d\u5206\u306f \\( \\sqrt{(x+3)^{2}-12x} \\) \u3068\u3044\u3046\u591a\u5c11\u30c9\u30ad\u30c3\u3068\u3059\u308b\u5f62\u3092\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u8a08\u7b97\u3092\u9032\u3081\u308b\u3046\u3061\u306b $$\\sqrt{(x+3)^{2}-12x}=\\sqrt{(x^{2}+6x+9)- […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,4,16],"tags":[23],"class_list":["post-1365","post","type-post","status-publish","format-standard","hentry","category-7","category-4","category-16","tag-education3"],"_links":{"self":[{"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1365","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1365"}],"version-history":[{"count":11,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1365\/revisions"}],"predecessor-version":[{"id":1376,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1365\/revisions\/1376"}],"wp:attachment":[{"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/math.co.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}