{"id":11504,"date":"2022-12-09T15:33:54","date_gmt":"2022-12-09T06:33:54","guid":{"rendered":"https:\/\/hatsudy.com\/jp\/?p=11504"},"modified":"2022-12-12T04:50:56","modified_gmt":"2022-12-11T19:50:56","slug":"logarithm-2","status":"publish","type":"post","link":"https:\/\/hatsudy.com\/jp\/logarithm-2.html","title":{"rendered":"\u5bfe\u6570\u95a2\u6570\uff1a\u30b0\u30e9\u30d5\u306e\u5f62\u3084\u65b9\u7a0b\u5f0f\u30fb\u4e0d\u7b49\u5f0f\u306e\u8a08\u7b97\u3001\u771f\u6570\u6761\u4ef6"},"content":{"rendered":"\n<p>\u6307\u6570\u3068\u5bfe\u6570\u306f\u89aa\u305b\u304d\u3067\u3042\u308a\u3001\u6307\u6570\u3092\u5bfe\u6570\u3078\u5909\u63db\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u6307\u6570\u95a2\u6570\u304c\u5b58\u5728\u3059\u308b\u305f\u3081\u3001\u5bfe\u6570\u95a2\u6570\u3082\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u5bfe\u6570\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u3084\u8a08\u7b97\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u306a\u304a\u3001\u5bfe\u6570\u306b\u306f\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002\u3069\u306e\u3088\u3046\u306a\u6570\u5b57\u3067\u3042\u3063\u3066\u3082\u5e95\u3084\u771f\u6570\u306b\u306a\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u5bfe\u6570\u95a2\u6570\u3067\u306f\u3001\u5e95\u3084\u771f\u6570\u306e\u5024\u304c\u53d6\u308a\u5f97\u308b\u7bc4\u56f2\u3092\u78ba\u8a8d\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n<p>\u5bfe\u6570\u306e\u6027\u8cea\u3092\u7406\u89e3\u3057\u305f\u3089\u3001\u5bfe\u6570\u65b9\u7a0b\u5f0f\u3084\u5bfe\u6570\u4e0d\u7b49\u5f0f\u306b\u95a2\u3059\u308b\u554f\u984c\u3092\u89e3\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002\u3053\u306e\u3068\u304d\u3001\u771f\u6570\u6761\u4ef6\u306b\u6ce8\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u5bfe\u6570\u95a2\u6570\u3092\u5229\u7528\u3057\u3001\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002\u7f6e\u304d\u63db\u3048\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u4e8c\u6b21\u95a2\u6570\u3084\u4e09\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u3092\u5f97\u3066\u8a08\u7b97\u3059\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u8003\u3048\u3066\u5bfe\u6570\u95a2\u6570\u306b\u95a2\u3059\u308b\u554f\u984c\u3092\u89e3\u3051\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u5bfe\u6570\u306e\u6027\u8cea\u3092\u5229\u7528\u3057\u3066\u3001\u5bfe\u6570\u95a2\u6570\u3092\u89e3\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u5bfe\u6570\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u3068\u5f62<\/h2>\n<p>\u6307\u6570\u3092\u5bfe\u6570\u3078\u5909\u63db\u3059\u308b\u3068\u304d\u3001\u30b0\u30e9\u30d5\u306e\u5f62\u304c\u5909\u5316\u3057\u307e\u3059\u3002\u6307\u6570\u95a2\u6570\u3068\u5bfe\u6570\u95a2\u6570\u3067\u3069\u306e\u3088\u3046\u306b\u30b0\u30e9\u30d5\u304c\u5909\u308f\u308b\u306e\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u6307\u6570\u95a2\u6570\\(y=a^x\\)\u306e\u30b0\u30e9\u30d5\u306b\u5bfe\u3057\u3066\u3001\\(y=x\\)\u306e\u30b0\u30e9\u30d5\u3092\u57fa\u6e96\u306b\u5bfe\u79f0\u79fb\u52d5\u3055\u305b\u308b\u3068\\(y=log_ax\\)\u306e\u30b0\u30e9\u30d5\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u304c\u6307\u6570\u95a2\u6570\u3068\u5bfe\u6570\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u3067\u3059\u3002<\/p>\n<p><img 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style=\"color: #0000ff;\">\u5bfe\u6570\u3092\u5229\u7528\u3059\u308b\u3068\u304d\u3001\u5e95\u306e\u6761\u4ef6\u306f\\(a&gt;0\\)\u304b\u3064\\(a\u22601\\)\u3067\u3059\u3002<\/span><\/p>\n<p>\u307e\u305f\\(a&gt;0\\)\u3067\u3042\u308b\u305f\u3081\u3001\u6307\u6570\u306e\u8a08\u7b97\u3092\u3059\u308b\u3068\u304d\u5fc5\u305a\\(M&gt;0\\)\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081<span style=\"color: #0000ff;\">\u5bfe\u6570\u3092\u5229\u7528\u3059\u308b\u3068\u304d\u3001\u771f\u6570\\(M\\)\u306e\u5024\u306f\u5fc5\u305a\\(M&gt;0\\)\u306b\u306a\u308a\u307e\u3059\u3002<\/span>\u3053\u308c\u3092\u771f\u6570\u6761\u4ef6\u3068\u3044\u3044\u307e\u3059\u3002\u5bfe\u6570\u95a2\u6570\u3067\u306f\u771f\u6570\u6761\u4ef6\u3092\u5229\u7528\u3057\u3066\u7bc4\u56f2\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u591a\u3044\u305f\u3081\u3001\u5fc5\u305a\u7406\u89e3\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u6982\u5ff5\u3067\u3059\u3002<\/p>\n<h2>\u5bfe\u6570\u65b9\u7a0b\u5f0f\u306e\u8a08\u7b97\uff1a\u771f\u6570\u6761\u4ef6\u306e\u5229\u7528<\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b\u5bfe\u6570\u306b\u95a2\u3059\u308b\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5bfe\u6570\u65b9\u7a0b\u5f0f\u306e\u8a08\u7b97\u3067\u306f\u3001\u5f97\u3089\u308c\u305f\u7b54\u3048\u306e\u3046\u3061\u3001\u3069\u3061\u3089\u304b\u4e00\u65b9\u306e\u307f\u304c\u7b54\u3048\u3067\u3042\u308b\u30b1\u30fc\u30b9\u306f\u591a\u3044\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u5e95\u306e\u6761\u4ef6\u3084\u771f\u6570\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u984c\u3068\u3057\u3066\u4ee5\u4e0b\u306e\u554f\u984c\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\\(log_2x+log_2(x-2)=3\\)<\/li>\n<\/ul>\n<p>\u8a08\u7b97\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(log_2x+log_2(x-2)=3\\)<\/p>\n<p>\\(log_2x(x-2)=3log_22\\)<\/p>\n<p>\\(log_2x(x-2)=log_22^3\\)<\/p>\n<p>\\(log_2x(x-2)=log_28\\)<\/p>\n<p>\\(x(x-2)=8\\)<\/p>\n<p>\\(x^2-2x-8=0\\)<\/p>\n<p>\\((x-4)(x+2)=0\\)<\/p>\n<p>\\(x=-2,4\\)<\/p>\n<p>\u305f\u3060\u3001\u7b54\u3048\u306f\\(x=-2,4\\)\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u7406\u7531\u3068\u3057\u3066\u306f\u3001\u771f\u6570\u6761\u4ef6\u3092\u8003\u616e\u3057\u3066\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u554f\u984c\u306e\u5f0f\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\\(log_2x+log_2(x-2)=3\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u771f\u6570\u6761\u4ef6\u3088\u308a\u3001\u4ee5\u4e0b\u306e2\u3064\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(x&gt;0\\)<\/li>\n<li>\\(x-2&gt;0\\)<\/li>\n<\/ul>\n<p>2\u3064\u306e\u6761\u4ef6\u3092\u540c\u6642\u306b\u6e80\u305f\u3059\u305f\u3081\u306b\u306f\u3001\\(x&gt;2\\)\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\\(x=-2\\)\u3068\\(x=4\\)\u306b\u3064\u3044\u3066\u3001\u771f\u6570\u6761\u4ef6\u3092\u6e80\u305f\u3059\u306e\u306f\\(x=4\\)\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u7b54\u3048\u306f\\(x=4\\)\u3067\u3059\u3002<\/p>\n<h3>\u7f6e\u304d\u63db\u3048\u306b\u3088\u308a\u3001\u5bfe\u6570\u65b9\u7a0b\u5f0f\u3092\u89e3\u304f<\/h3>\n<p>\u6b21\u306b\u3001\u7f6e\u304d\u63db\u3048\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u5bfe\u6570\u65b9\u7a0b\u5f0f\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002\u6307\u6570\u95a2\u6570\u306e\u8a08\u7b97\u3067\u306f\u7f6e\u304d\u63db\u3048\u3092\u3072\u3093\u3071\u3093\u306b\u5229\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u5bfe\u6570\u95a2\u6570\u3067\u3082\u540c\u69d8\u3067\u3059\u3002\u7279\u306b<span style=\"color: #0000ff;\">\u5bfe\u6570\u3092\u5229\u7528\u3057\u3066\u4e8c\u4e57\u3084\u4e09\u4e57\u306e\u8a08\u7b97\u3092\u3059\u308b\u5834\u5408\u3001\u7f6e\u304d\u63db\u3048\u306b\u3088\u3063\u3066\u554f\u984c\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\\(log_x2=log_2x^2+1\\)<\/li>\n<\/ul>\n<p>\u307e\u305a\u3001\u5e95\u306e\u6761\u4ef6\u3068\u771f\u6570\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(log_x2\\)\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u5e95\u306e\u6761\u4ef6\u3088\u308a\\(x&gt;0\\)\u304b\u3064\\(x\u22601\\)\u3067\u3059\u3002\u307e\u305f\\(log_2x^2\\)\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u771f\u6570\u6761\u4ef6\u3088\u308a\\(x^2&gt;0\\)\u3001\u3064\u307e\u308a\\(x\u22600\\)\u3067\u3059\u3002\u5bfe\u6570\u65b9\u7a0b\u5f0f\u306e\u7b54\u3048\u3092\u5f97\u308b\u3068\u304d\u3001\u3053\u306e2\u3064\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(log_x2=log_2x^2+1\\)<\/p>\n<p>\\(\\displaystyle\\frac{log_22}{log_2x}=2log_2x+1\\)<\/p>\n<p>\\(\\displaystyle\\frac{1}{log_2x}=2log_2x+1\\)<\/p>\n<p>\u6b21\u306b\u3001\\(t=log_2x\\)\u3068\u8003\u3048\u3066\u7f6e\u304d\u63db\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(\\displaystyle\\frac{1}{t}=2t+1\\)<\/p>\n<p>\\(1=2t^2+t\\)<\/p>\n<p>\\(2t^2+t-1=0\\)<\/p>\n<p>\\((2t-1)(t+1)=0\\)<\/p>\n<p>\\(t=-1,\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\u305d\u3053\u3067\u3001\\(log_2x=-1\\)\u3068\\(log_2x=\\displaystyle\\frac{1}{2}\\)\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u30fb\\(log_2x=-1\\)\u306e\u8a08\u7b97<\/strong><\/p>\n<p>\\(log_2x=-1\\)<\/p>\n<p>\\(log_2x=-1log_22\\)<\/p>\n<p>\\(log_2x=log_22^{-1}\\)<\/p>\n<p>\\(log_2x=log_2\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\\(x=\\displaystyle\\frac{1}{2}\\)<\/p>\n<p><strong>\u30fb\\(log_2x=\\displaystyle\\frac{1}{2}\\)\u306e\u8a08\u7b97<\/strong><\/p>\n<p>\\(log_2x=\\displaystyle\\frac{1}{2}\\)<\/p>\n<p>\\(log_2x=\\displaystyle\\frac{1}{2}log_22\\)<\/p>\n<p>\\(log_2x=log_22^{\\frac{1}{2}}\\)<\/p>\n<p>\\(log_2x=log_2\\sqrt{2}\\)<\/p>\n<p>\\(x=\\sqrt{2}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(x=\\displaystyle\\frac{1}{2},\\sqrt{2}\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u306a\u304a\u3001\\(x=\\displaystyle\\frac{1}{2},\\sqrt{2}\\)\u306f\u5e95\u306e\u6761\u4ef6\u3068\u771f\u6570\u6761\u4ef6\u3092\u6e80\u305f\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u7b54\u3048\u306f\\(x=\\displaystyle\\frac{1}{2},\\sqrt{2}\\)\u3067\u3059\u3002<\/p>\n<h3>\u5bfe\u6570\u4e0d\u7b49\u5f0f\u3068\u771f\u6570\u6761\u4ef6\u306e\u5229\u7528<\/h3>\n<p>\u771f\u6570\u6761\u4ef6\u304c\u3088\u308a\u91cd\u8981\u306b\u306a\u308b\u306e\u304c\u5bfe\u6570\u4e0d\u7b49\u5f0f\u3067\u3059\u3002\u5bfe\u6570\u4e0d\u7b49\u5f0f\u306e\u7bc4\u56f2\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\u3001\u771f\u6570\u6761\u4ef6\u3092\u5229\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u5bfe\u6570\u4e0d\u7b49\u5f0f\u3067\u306f\u3001\u5e95\\(a\\)\u306e\u5024\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002\u6307\u6570\u4e0d\u7b49\u5f0f\u3067\u306f\u3001\\(a&gt;1\\)\u306a\u306e\u304b\u3001\u305d\u308c\u3068\u3082\\(0&lt;a&lt;1\\)\u306a\u306e\u304b\u306b\u3088\u3063\u3066\u5927\u5c0f\u95a2\u4fc2\u304c\u5909\u5316\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u5bfe\u6570\u4e0d\u7b49\u5f0f\u3067\u3082\u540c\u69d8\u3067\u3042\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4e0d\u7b49\u5f0f\u306e\u5411\u304d\u304c\u5909\u5316\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(a&gt;1\\)\u306e\u5834\u5408\uff1a\\(log_aA&gt;log_aB\\)\u306a\u3089\u3001\\(A&gt;B\\)<\/li>\n<li>\\(0&lt;a&lt;1\\)\u306e\u5834\u5408\uff1a\\(log_aA&gt;log_aB\\)\u306a\u3089\u3001\\(A&lt;B\\)<\/li>\n<\/ul>\n<p>\u30b0\u30e9\u30d5\u3092\u78ba\u8a8d\u3059\u308c\u3070\u3001\u306a\u305c\u3053\u306e\u95a2\u4fc2\u306b\u306a\u308b\u306e\u304b\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/12\/jdcb2.jpg\" alt=\"\" width=\"600\" height=\"280\" class=\"aligncenter size-full wp-image-11519\" \/><\/p>\n<p>\\(0&lt;a&lt;1\\)\u306e\u5834\u5408\u3001\\(x\\)\u306e\u5024\u304c\u5927\u304d\u304f\u306a\u308b\u307b\u3069\u3001\\(y\\)\u306e\u5024\u306f\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001<span style=\"color: #ff0000;\">\\(0&lt;a&lt;1\\)\u306e\u5834\u5408\u306f\u5927\u5c0f\u95a2\u4fc2\u304c\u53cd\u5bfe\u306b\u306a\u308a\u307e\u3059\u3002<\/span>\u3053\u306e\u6027\u8cea\u3092\u7406\u89e3\u3057\u3066\u5bfe\u6570\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u304b\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n<p>\u307e\u305f\u5bfe\u6570\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u304f\u3068\u304d\u3001\u5fc5\u305a\u4ee5\u4e0b\u306e2\u3064\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\u5e95\u304c\u7570\u306a\u308b\u5834\u5408\u3001\u516c\u5f0f\u3092\u5229\u7528\u3057\u3066\u5e95\u3092\u305d\u308d\u3048\u308b<\/li>\n<li>\u771f\u6570\u6761\u4ef6\uff08\\(M&gt;0\\)\uff09\u3068\u5e95\u306e\u6761\u4ef6\uff08\\(a&gt;0,a\u22601\\)\uff09\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<\/ul>\n<p>\u5bfe\u6570\u4e0d\u7b49\u5f0f\u306b\u9650\u3089\u305a\u3001\u5bfe\u6570\u304c\u95a2\u308f\u308b\u307b\u304b\u306e\u8a08\u7b97\u3067\u3082\u5fc5\u9808\u3068\u306a\u308b\u624b\u9806\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u5fc5\u305a\u3053\u308c\u3089\u306e\u4f5c\u696d\u3092\u884c\u3044\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\\(log_22x&lt;log_327\\)<\/li>\n<\/ul>\n<p>\u5e95\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u540c\u3058\u5e95\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5f0f\u3092\u5909\u5f62\u3057\u307e\u3059\u3002<\/p>\n<p>\\(log_22x&lt;log_327\\)<\/p>\n<p>\\(log_22x&lt;log_33^3\\)<\/p>\n<p>\\(log_22x&lt;3\\)<\/p>\n<p>\\(log_22x&lt;3log_22\\)<\/p>\n<p>\\(log_22x&lt;log_28\\)<\/p>\n<p>\u5e95\u306f2\u3067\u3042\u308a\u30011\u3088\u308a\u5927\u304d\u3044\u305f\u3081\u3001\u5bfe\u6570\u3092\u5916\u3059\u3068\u304d\u306b\u4e0d\u7b49\u53f7\u306e\u5927\u5c0f\u95a2\u4fc2\u306f\u540c\u3058\u3067\u3059\u3002\u4e0d\u7b49\u53f7\u306e\u5411\u304d\u306f\u540c\u3058\u306b\u306a\u308b\u305f\u3081\u3001\u4e0d\u7b49\u53f7\u3092\u5916\u3059\u3068\u304d\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(2x&lt;8\\)<\/p>\n<p>\\(x&lt;4\\)<\/p>\n<p>\u5e95\u3092\u305d\u308d\u3048\u308b\u3053\u3068\u306b\u3088\u308a\u3001\\(x&lt;4\\)\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u305d\u308c\u3067\u306f\u3001\u771f\u6570\u6761\u4ef6\u3068\u5e95\u306e\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u554f\u984c\u306e\u5f0f\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u5e95\u306e\u6761\u4ef6\u306f\u6e80\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u771f\u6570\u6761\u4ef6\u3088\u308a\u3001\\(2x&gt;0\\)\u3067\u3059\u3002\u3064\u307e\u308a\u3001\\(x&gt;0\\)\u3067\u3059\u3002\u305d\u3053\u3067\u771f\u6570\u6761\u4ef6\u3068\u5408\u308f\u305b\u3066\u3001\\(0&lt;x&lt;4\\)\u304c\u7b54\u3048\u3068\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<h3>\u5bfe\u6570\u95a2\u6570\u3067\u306e\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024<\/h3>\n<p>\u6307\u6570\u95a2\u6570\u306e\u8a08\u7b97\u3067\u7f6e\u304d\u63db\u3048\u3092\u5229\u7528\u3057\u305f\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u5bfe\u6570\u95a2\u6570\u3067\u3082\u7f6e\u304d\u63db\u3048\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7f6e\u304d\u63db\u3048\u306b\u3088\u3063\u3066\u4e8c\u6b21\u95a2\u6570\u3084\u4e09\u6b21\u95a2\u6570\u3092\u8a08\u7b97\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u984c\u3092\u5229\u7528\u3057\u3066\u3001\u5bfe\u6570\u95a2\u6570\u3067\u306e\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\\(\\displaystyle\\frac{1}{4}\u2266x\u22662\\)\u306e\u3068\u304d\u3001\\(y=(log_24x)(log_2x)\\)\u306b\u3064\u3044\u3066\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u3092\u8a08\u7b97\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n<p>\\(y=(log_24x)(log_2x)\\)<\/p>\n<p>\\(y=(log_24+log_2x)(log_2x)\\)<\/p>\n<p>\\(y=(log_22^2+log_2x)(log_2x)\\)<\/p>\n<p>\\(y=(2+log_2x)(log_2x)\\)<\/p>\n<p>\u3053\u3053\u3067\u3001\\(log_2x=t\\)\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u8a08\u7b97\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\\(y=(2+t)t\\)<\/p>\n<p>\\(y=t^2+2t\\)<\/p>\n<p>\\(y=(t+1)^2-1\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(t=-1\\)\u3092\u8ef8\u3068\u3059\u308b\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u306a\u304a\u554f\u984c\u6587\u3088\u308a\u3001\\(x\\)\u306e\u7bc4\u56f2\u306f\\(\\displaystyle\\frac{1}{4}\u2266x\u22662\\)\u3067\u3042\u308a\u3001\u3053\u308c\u306f\u771f\u6570\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\\(log_2x=t\\)\u3067\u3042\u308b\u305f\u3081\u3001\\(t\\)\u306e\u7bc4\u56f2\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(\\displaystyle\\frac{1}{4}\u2266x\u22662\\)<\/p>\n<p>\\(log_2\\displaystyle\\frac{1}{4}\u2266log_2x\u2266log_22\\)<\/p>\n<p>\\(-2\u2266t\u22661\\)<\/p>\n<p>\u5e95\u306f2\u3067\u3042\u308b\u305f\u3081\u3001\u5bfe\u6570\u3092\u5916\u3059\u3068\u304d\u306b\u4e0d\u7b49\u53f7\u306e\u5411\u304d\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u3002\u307e\u305f\\(t\\)\u306e\u7bc4\u56f2\u3068\u4e8c\u6b21\u65b9\u7a0b\u5f0f\u306e\u30b0\u30e9\u30d5\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/12\/xvqh3.jpg\" alt=\"\" width=\"378\" height=\"295\" class=\"aligncenter size-full wp-image-11538\" 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\u306a\u304a\u3001\u5bfe\u6570\u306b\u306f\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002\u3069\u306e\u3088\u3046\u306a\u6570\u5b57\u3067\u3042\u3063\u3066\u3082\u5e95\u3084\u771f\u6570\u306b\u306a 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