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\/><\/p>\n<p>\\(y&gt;0\\)\u306e\u5834\u5408\u3001\\(x\\)\u8ef8\u3068\u5171\u6709\u70b9\u3092\u3082\u3064\u304b\u3069\u3046\u304b\u306b\u3088\u3063\u3066\\(x\\)\u306e\u7bc4\u56f2\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u4e0a\u306e\u56f3\u3067\\(x\\)\u8ef8\u3068\u5171\u6709\u70b9\u3092\u3082\u3064\u5834\u5408\u3001\\(x=\u03b1,\u03b2\\)\u3068\u3059\u308b\u3068\u304d\u3001\u30b0\u30e9\u30d5\u3088\u308a\u7b54\u3048\u306f\\(x&lt;\u03b1\u3001\u03b2&lt;x\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u307e\u305f\\(x\\)\u3068\u5171\u6709\u70b9\u3092\u3082\u305f\u306a\u3044\u5834\u5408\u3001\\(x\\)\u304c\u3069\u306e\u6570\u5b57\u3067\u3042\u3063\u3066\u3082\\(y&gt;0\\)\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u3059\u3079\u3066\u306e\u5b9f\u6570\u304c\u7b54\u3048\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3067\\(y&lt;0\\)\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306f\u3069\u306e\u3088\u3046\u306b\u8003\u3048\u308c\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002\\(x\\)\u8ef8\u3068\u5171\u6709\u70b9\u3092\u3082\u3064\u5834\u5408\u3001\u30b0\u30e9\u30d5\u3088\u308a\\(\u03b1&lt;x&lt;\u03b2\\)\u306e\u3068\u304d\u306b\\(y&lt;0\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u305f\u3060\\(x\\)\u8ef8\u3068\u5171\u6709\u70b9\u3092\u3082\u305f\u306a\u3044\u5834\u5408\u3001\\(y&lt;0\\)\u306b\u306a\u308b\u90e8\u5206\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u89e3\u306a\u3057\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u5148\u307b\u3069\u306e\u56f3\u306f\u524d\u8ff0\u306e\u901a\u308a\\(a&gt;0\\)\u306e\u30b0\u30e9\u30d5\uff08\u4e0b\u306b\u51f8\u306e\u30b0\u30e9\u30d5\uff09\u3067\u3059\u3002\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u306f\\(a&lt;0\\)\u306e\u30b0\u30e9\u30d5\uff08\u4e0b\u306b\u51f8\u306e\u30b0\u30e9\u30d5\uff09\u3082\u3042\u308b\u305f\u3081\u3001\u5fc5\u305a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3053\u3068\u3067\u554f\u984c\u3092\u89e3\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u56e0\u6570\u5206\u89e3\u307e\u305f\u306f\u89e3\u306e\u516c\u5f0f\u306b\u3088\u3063\u3066\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u4f5c\u308b<\/h3>\n<p>\u306a\u304a\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u304f\u3068\u304d\u3001\u56e0\u6570\u5206\u89e3\u307e\u305f\u306f\u5224\u5225\u5f0f\u3092\u5229\u7528\u3057\u307e\u3059\u3002\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u8abf\u3079\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\\(x\\)\u306e\u7bc4\u56f2\u3092\u8abf\u3079\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u554f\u984c\u3092\u89e3\u304f\u9806\u756a\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u56e0\u6570\u5206\u89e3\u3092\u884c\u3046<\/li>\n<li>\u56e0\u6570\u5206\u89e3\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u5224\u5225\u5f0f\u3092\u4f7f\u3046<\/li>\n<li>\\(D&gt;0\\)\u306e\u5834\u5408\u3001\u89e3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3059\u308b<\/li>\n<\/ul>\n<p>\u4e8c\u6b21\u95a2\u6570\u3067\u3082\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u3082\u3001\u56e0\u6570\u5206\u89e3\u3067\u304d\u308b\u5834\u5408\u306f\u7d20\u65e9\u304f\u7b54\u3048\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5148\u307b\u3069\u3001\\(x^2-x-6&gt;0\\)\u3092\u56e0\u6570\u5206\u89e3\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\\((x-3)(x+2)&gt;0\\)\u3078\u3068\u5909\u5f62\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\\(x&lt;-2,3&lt;x\\)\u3068\u3044\u3046\u7b54\u3048\u3092\u5f97\u307e\u3057\u305f\u3002<\/p>\n<p><strong>\u30fb\u5224\u5225\u5f0f\u3084\u89e3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3059\u308b<\/strong><\/p>\n<p>\u4e00\u65b9\u3001\u56e0\u6570\u5206\u89e3\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u3069\u306e\u3088\u3046\u306b\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u3051\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u307e\u305a\u3001\\(D\\)\uff08\u5224\u5225\u5f0f\uff09\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u3082\u3064\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\\(D&lt;0\\)\u3067\u306f\u3001\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u306f\u306a\u3044\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u7b54\u3048\u306f\u300c\u3059\u3079\u3066\u306e\u5b9f\u6570\u300d\u307e\u305f\u306f\u300c\u89e3\u306a\u3057\u300d\u3067\u3059\u3002\u4e0b\u306b\u51f8\u3001\u307e\u305f\u306f\u4e0a\u306b\u51f8\u306e\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u300c\u3059\u3079\u3066\u306e\u5b9f\u6570\u300d\u300c\u89e3\u306a\u3057\u300d\u306e\u3069\u3061\u3089\u304c\u7b54\u3048\u306a\u306e\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u306a\u304a\u3001\\(D\u22670\\)\u306e\u5834\u5408\u306f\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u89e3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3057\u3001\u7b54\u3048\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\\(x^2+2x-1&lt;0\\)<\/li>\n<\/ul>\n<p>\\(y=x^2+2x-1\\)\u3068\u8003\u3048\u3066\\(D\\)\uff08\u5224\u5225\u5f0f\uff09\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(2^2-4\u00d71\u00d7(-1)=8\\)<\/li>\n<\/ul>\n<p>\\(D&gt;0\\)\u3067\u3042\u308b\u305f\u3081\u3001\\(y=x^2+2x-1\\)\u306e\u4e8c\u6b21\u95a2\u6570\u306f\\(x\\)\u8ef8\u30682\u3064\u306e\u7570\u306a\u308b\u5171\u6709\u70b9\u3092\u3082\u3061\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u89e3\u306e\u516c\u5f0f\u3092\u5229\u7528\u3057\u3066\u7b54\u3048\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(x=\\displaystyle\\frac{-b\u00b1\\sqrt{b^2-4ac}}{2a}\\)<\/p>\n<p>\u89e3\u306e\u516c\u5f0f\u306b\u4ee3\u5165\u3059\u308b\u3068<\/p>\n<p>\\(x=\\displaystyle\\frac{-2\u00b1\\sqrt{2^2-4\u00d71\u00d7(-1)}}{2\u00d71}\\)<\/p>\n<p>\\(x=\\displaystyle\\frac{-2\u00b1\\sqrt{8}}{2}\\)<\/p>\n<p>\\(x=\\displaystyle\\frac{-2\u00b12\\sqrt{2}}{2}\\)<\/p>\n<p>\\(x=-1\u00b1\\sqrt{2}\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(x=-1\u00b1\\sqrt{2}\\)\u306e\u3068\u304d\u306b\u4e8c\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u304c\\(x\\)\u8ef8\u3068\u4ea4\u308f\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u306a\u304a\u3001\u5fc5\u305a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3053\u3068\u3067\\(y=x^2+2x-1&lt;0\\)\u306e\u7b54\u3048\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002\u4eba\u306b\u3088\u3063\u3066\u306f\u3001\u30b0\u30e9\u30d5\u3092\u63cf\u304b\u306a\u3044\u3053\u3068\u306b\u3088\u3063\u3066\u3001\\(x=-1\u00b1\\sqrt{2}\\)\u3088\u308a\u3001\\(x&lt;-1\u00b1\\sqrt{2}\\)\u3068\u7b54\u3048\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30b0\u30e9\u30d5\u3092\u63cf\u3051\u3070\u6b63\u3057\u3044\u7b54\u3048\u3092\u51fa\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr11.jpg\" alt=\"\" width=\"500\" height=\"289\" class=\"aligncenter size-full wp-image-4776\" \/><\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(-1-\\sqrt{2}&lt;x&lt;-1+\\sqrt{2}\\)\u304c\u7b54\u3048\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u89e3\u304b\u3089\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u6c7a\u5b9a\u3059\u308b<\/h3>\n<p>\u306a\u304a\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u89e3\u304b\u3089\u3001\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u306e\u7b54\u3048\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\\(ax^2+bx+8&gt;0\\)\u306e\u89e3\u304c\\(-2&lt;x&lt;4\\)\u3067\u3059\u3002\\(a\\)\u3068\\(b\\)\u306e\u5024\u3092\u6c42\u3081\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<p>\u307e\u305a\u3001\\(y=ax^2+bx+8&gt;0\\)\u306e\u89e3\u304c\\(-2&lt;x&lt;4\\)\u3068\u306a\u308b\u305f\u3081\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u30b0\u30e9\u30d5\u3067\u3042\u308c\u3070\u3044\u3044\u3067\u3057\u3087\u3046\u304b\u3002<span style=\"color: #0000ff;\">\\(a\\)\u306e\u5024\u304c\u30d7\u30e9\u30b9\u306a\u306e\u304b\u30de\u30a4\u30ca\u30b9\u306a\u306e\u304b\u306b\u3088\u3063\u3066\u30b0\u30e9\u30d5\u306e\u5f62\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/span><\/p>\n<p>\u305d\u3053\u3067\u7c21\u5358\u306a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u3069\u3061\u3089\u306e\u30b0\u30e9\u30d5\u304c\\(y&gt;0\\)\u306e\u3068\u304d\u306b\\(-2&lt;x&lt;4\\)\u3068\u306a\u308b\u306e\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr12.jpg\" alt=\"\" width=\"600\" height=\"256\" class=\"aligncenter size-full wp-image-4777\" \/><\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\\(y&gt;0\\)\u3068\\(-2&lt;x&lt;4\\)\u306e\u4e21\u65b9\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u306f\u3001\u5fc5\u305a\\(a&lt;0\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u30b0\u30e9\u30d5\u3092\u63cf\u304b\u306a\u3044\u3068\\(a&lt;0\\)\u306b\u306a\u308b\u7406\u7531\u3092\u7406\u89e3\u3057\u306b\u304f\u3044\u305f\u3081\u3001\u3084\u306f\u308a\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u304f\u3068\u304d\u306f\u7c21\u5358\u306a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u306e\u304c\u7b54\u3048\u3092\u51fa\u3059\u30b3\u30c4\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\\(x\\)\u306e\u7bc4\u56f2\u304c\\(-2&lt;x&lt;4\\)\u3067\u3042\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\((x-4)(x+2)&lt;0\\)<\/li>\n<\/ul>\n<p>\u305d\u3053\u3067\u3001\u5f0f\u306e\u5c55\u958b\u3092\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\((x-4)(x+2)&lt;0\\)<\/p>\n<p>\\(x^2-2x-8&lt;0\\)<\/p>\n<p>\u305f\u3060\u524d\u8ff0\u306e\u901a\u308a\u3001\u5fc5\u305a\\(a&lt;0\\)\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u4e21\u8fba\u306b-1\u3092\u304b\u3051\u307e\u3057\u3087\u3046\u3002\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(-x^2+2x+8&gt;0\\)<\/p>\n<p>\u305d\u306e\u5f8c\u3001\\(ax^2+bx+8&gt;0\\)\u3068\\(-x^2+2x+8&gt;0\\)\u3092\u6bd4\u8f03\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u7d50\u679c\u3001\\(a=-1,b=2\\)\u3067\u3042\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u5b9f\u6570\u89e3\u3092\u3082\u3064\u5024\u3092\u6c7a\u5b9a\u3059\u308b<\/h3>\n<p>\u306a\u304a\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u4e8c\u6b21\u95a2\u6570\u306e\u5024\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001<span style=\"color: #0000ff;\">\u5224\u5225\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u5b9f\u6570\u89e3\u3092\u3082\u3064\\(x\\)\u306e\u7bc4\u56f2\u3092\u6c7a\u3081\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u4e8c\u6b21\u95a2\u6570\u304c\u5b9f\u6570\u89e3\u3092\u3082\u305f\u306a\u3044\\(k\\)\u306e\u7bc4\u56f2\u3092\u6c42\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\\(x^2+kx+k+3=0\\)<\/li>\n<\/ul>\n<p>\u5b9f\u6570\u89e3\u3092\u3082\u3064\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001\u5224\u5225\u5f0f\u3092\u5229\u7528\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u3002\\(D&gt;0\\)\u306e\u3068\u304d\u3001\u4e8c\u6b21\u95a2\u6570\u306f2\u3064\u306e\u7570\u306a\u308b\u89e3\u3092\u3082\u3061\u307e\u3059\u3002\\(D=0\\)\u306e\u3068\u304d\u3001\u4e8c\u6b21\u95a2\u6570\u306f1\u3064\u306e\u89e3\u3092\u3082\u3061\u307e\u3059\u3002\\(D&lt;0\\)\u306e\u3068\u304d\u3001\u4e8c\u6b21\u95a2\u6570\u306f\u89e3\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\\(D&lt;0\\)\u306e\u5f0f\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(D=b^2-4ac&lt;0\\)<\/p>\n<p>\u4ee3\u5165\u3059\u308b\u3068<\/p>\n<p>\\(k^2-4\u00d71\u00d7(k+3)&lt;0\\)<\/p>\n<p>\\(k^2-4k-12&lt;0\\)<\/p>\n<p>\\((k+2)(k-6)&lt;0\\)<\/p>\n<p>\\(y=(k+2)(k-6)&lt;0\\)\u3068\u306a\u308b\u305f\u3081\u306b\u306f\u3001\\(-2&lt;k&lt;6\\)\u3068\u306a\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3064\u307e\u308a\\(-2&lt;k&lt;6\\)\u306e\u3068\u304d\u3001\\(x^2+kx+k+3=0\\)\u306f\u89e3\u3092\u3082\u3061\u307e\u305b\u3093\u3002\u3053\u3046\u3057\u3066\u3001\\(k\\)\u306e\u7bc4\u56f2\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u9023\u7acb\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u89e3\u304d\u65b9<\/h2>\n<p>\u3053\u3053\u307e\u3067\u306e\u5185\u5bb9\u3092\u7406\u89e3\u3059\u308c\u3070\u3001\u9023\u7acb\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u9023\u7acb\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u306f\u3001\u4e8c\u3064\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u6e80\u305f\u3059\\(x\\)\u306e\u7bc4\u56f2\u3092\u8003\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u306f\u3069\u306e\u3088\u3046\u306a\u7b54\u3048\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\\(\\begin{eqnarray} \\left\\{\\begin{array}{l}x^2+3x-4&lt;0\\\\x^2+5x+6\u22670\\end{array}\\right.\\end{eqnarray}\\)<\/p>\n<p>\u307e\u305a\u3001\u305d\u308c\u305e\u308c\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u89e3\u304d\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\\(x^2+3x-4&lt;0\\)\u306e\\(x\\)\u306e\u7bc4\u56f2<\/strong><\/p>\n<p>\\(x^2+3x-4&lt;0\\)<\/p>\n<p>\\((x-1)(x+4)&lt;0\\)<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\\(-4&lt;x&lt;1\\)\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\\(x^2+5x+6\u22670\\)\u306e\\(x\\)\u306e\u7bc4\u56f2<\/strong><\/p>\n<p>\\(x^2+5x+6\u22670\\)<\/p>\n<p>\\((x+2)(x+3)\u22670\\)<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\\(x\u2266-3,-2\u2266x\\)\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u203b\u30b0\u30e9\u30d5\u3092\u63cf\u3044\u3066\u3044\u306a\u3044\u3082\u306e\u306e\u3001\u5b9f\u969b\u306b\\(x\\)\u306e\u7bc4\u56f2\u3092\u898b\u3064\u3051\u308b\u3068\u304d\u306f\u7c21\u5358\u306a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308c\u3070\u3001\u8a08\u7b97\u30df\u30b9\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u30012\u3064\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u3064\u3044\u3066\u3001\\(x\\)\u306e\u7bc4\u56f2\u304c\u308f\u304b\u3063\u305f\u3089\u56f3\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr6.jpg\" alt=\"\" width=\"566\" height=\"168\" class=\"aligncenter size-full wp-image-4778\" \/><\/strong><\/p>\n<p>\u524d\u8ff0\u306e\u901a\u308a\u3001<span style=\"color: #ff0000;\">\u9023\u7acb\u65b9\u7a0b\u5f0f\u3067\u306f2\u3064\u306e\u65b9\u7a0b\u5f0f\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/span>\u305d\u3053\u30672\u3064\u306e\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u3064\u3044\u3066\u3001\u4e21\u65b9\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\\(x\\)\u306e\u7bc4\u56f2\u3092\u63a2\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\\(-4&lt;x\u2266-3,-2\u2266x&lt;1\\)\u304c\u7b54\u3048\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u7d76\u5bfe\u5024\u3092\u3082\u3064\u4e8c\u6b21\u95a2\u6570\u3092\u63cf\u304f<\/h3>\n<p>\u4e00\u65b9\u3067\u7d76\u5bfe\u5024\u3092\u3082\u3064\u4e8c\u6b21\u95a2\u6570\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u307e\u3067\u3001\u7d76\u5bfe\u5024\u3092\u3082\u3064\u4e00\u6b21\u95a2\u6570\u3092\u89e3\u3044\u305f\u3053\u3068\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u540c\u3058\u3088\u3046\u306b\u3001\u4e8c\u6b21\u95a2\u6570\u3084\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u3064\u3044\u3066\u3082\u3001\u7d76\u5bfe\u5024\u3092\u3082\u3064\u5f0f\u3092\u89e3\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u7d76\u5bfe\u5024\u306e\u8a18\u53f7\u3092\u5916\u3059\u3068\u304d\u306f\u5834\u5408\u5206\u3051\u3092\u3057\u307e\u3059\u3002\u5024\u304c\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308b\u5834\u5408\u3001\u7d76\u5bfe\u5024\u306e\u8a18\u53f7\u3092\u5916\u3059\u3068\u304d\u306b-1\u3092\u304b\u3051\u307e\u3059\u3002\u3064\u307e\u308a\u3001<span style=\"color: #0000ff;\">\u5024\u304c\u30d7\u30e9\u30b9\u306a\u306e\u304b\u30de\u30a4\u30ca\u30b9\u306a\u306e\u304b\u306b\u3088\u3063\u3066\u5834\u5408\u5206\u3051\u3092\u3057\u307e\u3059\u3002<\/span>\u4e8c\u6b21\u95a2\u6570\u3084\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u3064\u3044\u3066\u3082\u3001\u5834\u5408\u5206\u3051\u3092\u3057\u3066\u554f\u984c\u3092\u89e3\u304f\u3068\u8003\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u4e8c\u6b21\u95a2\u6570\u306f\u3069\u306e\u3088\u3046\u306a\u30b0\u30e9\u30d5\u3092\u63cf\u304f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>\\(y=|x^2-5x+6|\\)<\/li>\n<\/ul>\n<p>\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u306f\u3001\u524d\u8ff0\u306e\u901a\u308a\u56e0\u6570\u5206\u89e3\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u6700\u521d\u306b\u8003\u3048\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u56e0\u6570\u5206\u89e3\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(y=|(x-2)(x-3)|\\)<\/li>\n<\/ul>\n<p>\u305d\u3053\u3067\\(|(x-2)(x-3)|\\)\u306e\u5024\u304c\u30d7\u30e9\u30b9\u306b\u306a\u308b\u306e\u304b\u3001\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308b\u306e\u304b\u306b\u3088\u3063\u3066\u5834\u5408\u5206\u3051\u3092\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u30fb\\(x\u22662,3\u2266x\\)\u306e\u5834\u5408<\/strong><\/p>\n<p>\\(x\u22662,3\u2266x\\)\u306e\u5834\u5408\u3001\u5024\u304c\u30d7\u30e9\u30b9\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u4f55\u3082\u305b\u305a\u306b\u7d76\u5bfe\u5024\u306e\u8a18\u53f7\u3092\u5916\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u4e8c\u6b21\u95a2\u6570\u3092\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\\(y=(x-2)(x-3)\\)<\/p>\n<p>\\(y=x^2-5x+6\\)<\/p>\n<p><strong>\u30fb\\(2&lt;x&lt;3\\)\u306e\u5834\u5408<\/strong><\/p>\n<p>\\(2&lt;x&lt;3\\)\u306e\u5834\u5408\u3001\u5fc5\u305a\u5024\u304c\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u7d76\u5bfe\u5024\u306e\u8a18\u53f7\u3092\u5916\u3059\u3068\u304d\u3001-1\u3092\u304b\u3051\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u4e8c\u6b21\u95a2\u6570\u3092\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\\(y=-(x-2)(x-3)\\)<\/p>\n<p>\\(y=-x^2+5x-6\\)<\/p>\n<p>\u3053\u308c\u3092\u30b0\u30e9\u30d5\u306b\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr13.jpg\" alt=\"\" width=\"300\" height=\"299\" class=\"aligncenter size-full wp-image-4779\" srcset=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr13.jpg 300w, https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr13-150x150.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" 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style=\"color: #0000ff;\">\\(x=0\\)\u306e\u3068\u304d\u306b\\(y\\)\u306e\u5024\u304c\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308b\u5834\u5408\u3001\u4e8c\u6b21\u95a2\u6570\u306e\u30b0\u30e9\u30d5\u306f\u5fc5\u305a\\(x\\)\u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u8ca0\u306e\u90e8\u5206\u306b\u4ea4\u70b9\u3092\u3082\u3061\u307e\u3059\u3002<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr15.jpg\" alt=\"\" width=\"355\" height=\"388\" class=\"aligncenter size-full wp-image-4780\" \/><\/p>\n<p>\u4e0b\u306b\u51f8\u306e\u30b0\u30e9\u30d5\u306e\u5834\u5408\u3001\\(x\\)\u306e\u5024\u304c\u5897\u3048\u308b\uff08\u307e\u305f\u306f\u6e1b\u308b\uff09\u3053\u3068\u306b\u3088\u3063\u3066\u3001\\(y\\)\u306e\u5024\u306f\u5897\u3048\u3066\u3044\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\\(x\\)\u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u8ca0\u306e\u90e8\u5206\u3067\u4ea4\u308f\u308b\\(a\\)\u306e\u5024\u3092\u51fa\u3057\u305f\u3044\u5834\u5408\u3001\\(f(0)&lt;0\\)\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3053\u3067\\(y=x^2+ax+a\\)\u306b\u3064\u3044\u3066\u3001\\(f(0)&lt;0\\)\u3068\u306a\u308b\u5f0f\u3092\u4f5c\u308a\u307e\u3059\u3002\\(x=0\\)\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(x^2+ax+a&lt;0\\)\uff1a\uff08\\(x=0\\))<\/p>\n<p>\\(a&lt;0\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\\(a&lt;0\\)\u306e\u5834\u5408\u3001\\(x\\)\u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u8ca0\u306e\u90e8\u5206\u3067\u4ea4\u308f\u308b\u4e8c\u6b21\u95a2\u6570\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\\(y\\)\u306e\u4f4d\u7f6e\u3001\u8ef8\u3001\u5224\u5225\u5f0f\u3092\u5229\u7528\u3057\u3066\u4e8c\u6b21\u95a2\u6570\u306e\u4f4d\u7f6e\u3092\u6c7a\u3081\u308b<\/h3>\n<p>\u306a\u304a\u3001\u5148\u307b\u3069\u306e\u89e3\u304d\u65b9\u306f\u300c\u4e8c\u6b21\u95a2\u6570\u304c\\(x\\)\u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u8ca0\u306e\u90e8\u5206\u3067\u4ea4\u308f\u308b\u5834\u5408\u300d\u306b\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u307b\u304b\u306e\u6761\u4ef6\u3067\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u7b54\u3048\u3092\u51fa\u305b\u3070\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u305d\u3053\u3067\u4ee5\u4e0b\u306e\u4e8c\u6b21\u95a2\u6570\u306b\u3064\u3044\u3066\u3001\\(x\\)\u8ef8\u3068\u306e2\u3064\u306e\u4ea4\u70b9\u304c\u6b63\u3068\u306a\u308b\u5834\u5408\u306e\\(a\\)\u306e\u7bc4\u56f2\u3092\u6c42\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li>\\(y=x^2-ax+a^2-2a\\)<\/li>\n<\/ul>\n<p><strong>\u30fb\\(y\\)\u306e\u4f4d\u7f6e\u306b\u7740\u76ee\u3059\u308b<\/strong><\/p>\n<p>\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u6b63\u306b\u306a\u308b\u305f\u3081\u306b\u306f\u3001\\(f(0)&gt;0\\)\u3067\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\\(x=0\\)\u3092\u4ee3\u5165\u3059\u308b\u3068\u304d\u3001\\(y\\)\u306e\u5024\u304c\u30d7\u30e9\u30b9\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3089\u3053\u305d\u3001\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u6b63\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(f(0)=x^2-ax+a^2-2a&gt;0\\)\uff1a\uff08\\(x=0\\)\u3092\u4ee3\u5165)<\/p>\n<p>\\(a^2-2a&gt;0\\)<\/p>\n<p>\\(a(a-2)&gt;0\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\\(a&lt;0,2&lt;a\\)\u306e\u5834\u5408\u3001\\(f(0)&gt;0\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u3064\u307e\u308a\\(a&lt;0,2&lt;a\\)\u3067\u3042\u308c\u3070\u3001\\(x=0\\)\u306e\u3068\u304d\u306b\\(y\\)\u306e\u5024\u306f\u30d7\u30e9\u30b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30fb\u8ef8\u306b\u7740\u76ee\u3059\u308b<\/strong><\/p>\n<p>\u305f\u3060\\(f(0)&gt;0\\)\u3067\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u300c\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u4e21\u65b9\u3068\u3082\u6b63\u306b\u306a\u308b\u300d\u300c\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u4e21\u65b9\u3068\u3082\u8ca0\u306b\u306a\u308b\u300d\u306e2\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr16.jpg\" alt=\"\" width=\"600\" height=\"223\" class=\"aligncenter size-full wp-image-4781\" \/><\/p>\n<p>\u305d\u3053\u3067\u3001\u8ef8\uff08\u9802\u70b9\u306e\\(x\\)\u5ea7\u6a19\uff09\u306b\u7740\u76ee\u3057\u307e\u3057\u3087\u3046\u3002<span style=\"color: #0000ff;\">\u8ef8\u304c\u6b63\u306e\u4f4d\u7f6e\u306b\u3042\u308c\u3070\u3001\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u304c\u4e21\u65b9\u3068\u3082\u6b63\u306b\u306a\u308a\u307e\u3059\u3002<\/span>\u305d\u3053\u3067\u3001\u8ef8\u306e\u4f4d\u7f6e\u3092\u8abf\u3079\u308b\u305f\u3081\u306b\u5e73\u65b9\u5b8c\u6210\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\(y=x^2-ax+a^2-2a\\)<\/p>\n<p>\\(y=(x^2-ax)+a^2-2a\\)<\/p>\n<p>\\(y=(\\color{red}{x^2-ax+\\displaystyle\\frac{1}{4}a^2}-\\displaystyle\\frac{1}{4}a^2)+a^2-2a\\)<\/p>\n<p>\\(y=(x^2-ax+\\displaystyle\\frac{1}{4}a^2)+\\displaystyle\\frac{3}{4}a^2-2a\\)<\/p>\n<p>\\(y=(x-\\displaystyle\\frac{1}{2}a)^2+\\displaystyle\\frac{3}{4}a^2-2a\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\u9802\u70b9\u306e\u5ea7\u6a19\u306f\\((\\displaystyle\\frac{1}{2}a,\\displaystyle\\frac{3}{4}a^2-2a)\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002\u9802\u70b9\u306e\\(x\\)\u5ea7\u6a19\u304c\u6b63\u3067\u3042\u308c\u3070\u3044\u3044\u305f\u3081\u3001\\(\\displaystyle\\frac{1}{2}a&gt;0\\)\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\\(a&gt;0\\)\u3067\u3059\u3002<\/p>\n<p><strong>\u30fb\u5224\u5225\u5f0f\u306b\u7740\u76ee\u3059\u308b<\/strong><\/p>\n<p>\u305f\u3060\\(f(0)&gt;0\\)\u3067\u3042\u308a\u3001\u9802\u70b9\u306e\\(x\\)\u5ea7\u6a19\u304c\u6b63\u3067\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u3001\u7b54\u3048\u3092\u5f97\u3089\u308c\u306a\u3044\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u3082\u305f\u306a\u3044\u30b1\u30fc\u30b9\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hatsudy.com\/jp\/wp-content\/uploads\/2022\/03\/jfdr17.jpg\" alt=\"\" width=\"600\" height=\"236\" class=\"aligncenter size-full wp-image-4782\" \/><\/p>\n<p>\u3053\u308c\u3092\u9632\u3050\u305f\u3081\u5224\u5225\u5f0f\u3092\u5229\u7528\u3057\u307e\u3057\u3087\u3046\u3002\\(D&gt;0\\)\u306e\u5834\u5408\u3001\u4e8c\u6b21\u95a2\u6570\u306f\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u3082\u3061\u307e\u3059\u3002\u305d\u306e\u305f\u3081\\(y=x^2-ax+a^2-2a\\)\u306b\u3064\u3044\u3066\u3001\u5224\u5225\u5f0f\u3092\u5229\u7528\u3057\u3066\u4ee5\u4e0b\u306e\u5f0f\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\\(D=b^2-4ac&gt;0\\)<\/p>\n<p>\u4ee3\u5165\u3059\u308b\u3068<\/p>\n<p>\\((-a)^2-4\u00d71\u00d7(a^2-2a)&gt;0\\)<\/p>\n<p>\\(a^2-4a^2+8a&gt;0\\)<\/p>\n<p>\\(-3a^2+8a&gt;0\\)<\/p>\n<p>\\(a^2-\\displaystyle\\frac{8}{3}a&lt;0\\)<\/p>\n<p>\\(a(a-\\displaystyle\\frac{8}{3})&lt;0\\)<\/p>\n<p>\u3053\u3046\u3057\u3066\u3001\\(0&lt;a&lt;\\displaystyle\\frac{8}{3}\\)\u306b\u306a\u308b\u3068\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u5148\u307b\u3069\u8a08\u7b97\u3057\u305f2\u3064\u306e\u6761\u4ef6\u3092\u8a18\u3057\u307e\u3057\u3087\u3046\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\\(f(0)&gt;0\\)\uff1a\\(a&lt;0,2&lt;a\\)<\/li>\n<li>\u9802\u70b9\u306e\u8ef8\u306e\u4f4d\u7f6e\uff1a\\(a&gt;0\\)<\/li>\n<li>\\(D&gt;0\\)\uff1a\\(0&lt;a&lt;\\displaystyle\\frac{8}{3}\\)<\/li>\n<\/ul>\n<p>\\(x\\)\u8ef8\u3068\u306e2\u3064\u306e\u4ea4\u70b9\u304c\u6b63\u3068\u306a\u308b\u5834\u5408\u3001\u3053\u306e3\u3064\u306e\u6761\u4ef6\u3092\u3059\u3079\u3066\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u7b54\u3048\u306f\\(2&lt;a&lt;\\displaystyle\\frac{8}{3}\\)\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u306e\u89e3\u304d\u65b9\u3092\u899a\u3048\u308b<\/h2>\n<p>\u4e8c\u6b21\u95a2\u6570\u306e\u767a\u5c55\u554f\u984c\u304c\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u3059\u3002\u307e\u305f\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u306f\u89e3\u304d\u65b9\u304c\u3042\u308b\u305f\u3081\u3001\u3069\u306e\u3088\u3046\u306b\u7b54\u3048\u3092\u51fa\u305b\u3070\u3044\u3044\u306e\u304b\u7406\u89e3\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306b\u306f4\u30d1\u30bf\u30fc\u30f3\u3042\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u30b0\u30e9\u30d5\u3092\u63cf\u304d\u3001\\(x\\)\u306e\u5024\u306b\u3088\u3063\u3066\\(y\\)\u306e\u5024\u304c\u30d7\u30e9\u30b9\u306b\u306a\u308b\u306e\u304b\u3001\u305d\u308c\u3068\u3082\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308b\u306e\u304b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308c\u3070\u3001\\(x\\)\u306e\u7bc4\u56f2\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u653e\u7269\u7dda\u3068\\(x\\)\u8ef8\u3068\u306e\u4ea4\u70b9\u3092\u6c42\u3081\u308b\u554f\u984c\u3067\u306f\u3001\u89e3\u304d\u65b9\u3092\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u3068\u7b54\u3048\u3092\u51fa\u3059\u306e\u304c\u96e3\u3057\u3044\u3067\u3059\u3002\u305d\u3053\u3067\\(y\\)\u306e\u4f4d\u7f6e\u3084\u8ef8\u306e\u4f4d\u7f6e\u3001\u5224\u5225\u5f0f\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u3069\u306e\u3088\u3046\u306a\u6761\u4ef6\u306e\u3068\u304d\u306b\u5f0f\u304c\u6210\u308a\u7acb\u3064\u306e\u304b\u7b54\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u89e3\u304d\u65b9\u3092\u77e5\u3063\u3066\u3044\u308c\u3070\u3001\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u306e\u554f\u984c\u3092\u89e3\u3051\u307e\u3059\u3002\u4e00\u65b9\u3001\u89e3\u304d\u65b9\u3092\u77e5\u3089\u306a\u3051\u308c\u3070\u7b54\u3048\u3092\u51fa\u305b\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u5224\u5225\u5f0f\u3092\u5229\u7528\u3057\u305f\u308a\u5ea7\u6a19\u306e\u4f4d\u7f6e\u3092\u78ba\u8a8d\u3057\u305f\u308a\u3057\u3066\u7b54\u3048\u3092\u51fa\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e8c\u6b21\u95a2\u6570\u3092\u5b66\u3093\u3060\u3042\u3068\u3001\u6b21\u306b\u52c9\u5f37\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u306e\u304c\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u3059\u3002\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3067\u306f\u4e0d\u7b49\u53f7\u304c\u5229\u7528\u3055\u308c\u3001\\(x\\)\u306e\u5024\u306b\u3088\u3063\u3066\\(y\\)\u306e\u5024\u304c\u30d7\u30e9\u30b9\u306b\u306a\u308b\u306e\u304b\u30de\u30a4\u30ca\u30b9\u306b\u306a\u308b\u306e\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002 \u5b9f\u969b\u306b\u4e8c\u6b21\u4e0d\u7b49\u5f0f\u3092\u89e3\u304f\u5834\u5408\u3001\u56e0\u6570\u5206\u89e3\u3092 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4773,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":{"0":"post-4772","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-h-math"},"_links":{"self":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4772","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/comments?post=4772"}],"version-history":[{"count":4,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4772\/revisions"}],"predecessor-version":[{"id":8072,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/posts\/4772\/revisions\/8072"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media\/4773"}],"wp:attachment":[{"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/media?parent=4772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/categories?post=4772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hatsudy.com\/jp\/wp-json\/wp\/v2\/tags?post=4772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}