{"id":2010,"date":"2021-12-05T19:22:49","date_gmt":"2021-12-05T10:22:49","guid":{"rendered":"https:\/\/www.roundown.net\/nyushi\/?p=2010"},"modified":"2021-12-15T00:26:23","modified_gmt":"2021-12-14T15:26:23","slug":"thr202101","status":"publish","type":"post","link":"https:\/\/www.roundown.net\/nyushi\/thr202101\/","title":{"rendered":"\u6771\u5317\u5927\u7406\u7cfb2021\uff1a\u7b2c1\u554f"},"content":{"rendered":"<hr \/>\n<p>\\(a , b\\) \u3092\u5b9f\u6570\u3068\u3059\u308b.\r\n\u66f2\u7dda \\(y = ax^2 +bx +1\\) \u304c \\(x\\) \u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u5171\u6709\u70b9\u3092\u6301\u305f\u306a\u3044\u3088\u3046\u306a\u70b9 \\(( a , b )\\) \u306e\u9818\u57df\u3092\u56f3\u793a\u305b\u3088.<\/p>\r\n<hr \/>\r\n<!--more-->\r\n<h4>\u3010 \u89e3 \u7b54 \u3011<\/h4>\r\n<p>\\(f(x) = ax^2 +bx +1\\) \u3068\u304a\u304f.<br \/>\r\n\\(f(x) = 0\\) \u304c\u6b63\u306e\u89e3\u3092\u3082\u305f\u306a\u3044\u6761\u4ef6\u3092\u8003\u3048\u308c\u3070\u3088\u3044.<\/p>\r\n<ol>\r\n<li><p><strong>1*<\/strong>\u3000\\(a = 0\\) \u306e\u3068\u304d\r\n\\[\r\nf(x) = bx +1\r\n\\]\r\n\u3064\u307e\u308a, \\(f(x)\\) \u306f\u9ad8\u3005 \\(1\\) \u6b21\u306e\u95a2\u6570\u3067\u3042\u308a, \\(f(0) = 1 \\gt 0\\) \u306a\u306e\u3067, \u6761\u4ef6\u3092\u307f\u305f\u3059\u306e\u306f\r\n\\[\r\nb \\geqq 0 \\quad ... [1]\r\n\\]<\/li>\r\n<li><p><strong>2*<\/strong>\u3000\\(a \\neq 0\\) \u306e\u3068\u304d<br \/>\r\n\\(2\\) \u6b21\u65b9\u7a0b\u5f0f \\(f(x) = 0\\) \u306e\u5224\u5225\u5f0f\u3092 \\(D\\) \u3068\u304a\u3051\u3070<\/p>\r\n<ul>\r\n<li><p>\\(D \\lt 0\\) \u306e\u3068\u304d<br \/>\r\n\\(f(x) = 0\\) \u306f\u89e3\u3092\u3082\u305f\u306a\u3044\u306e\u3067, \u6761\u4ef6\u3092\u307f\u305f\u3059.\r\n\\[\\begin{align}\r\nD = b^2 -4a & \\lt 0 \\\\\r\n\\text{\u2234} \\quad a & \\gt \\dfrac{b^2}{4} \\quad ... [2]\r\n\\end{align}\\]<\/li>\r\n<li><p>\\(D \\geqq 0\\) \u306e\u3068\u304d<br \/>\r\n\\(f(x) = 0\\) \u306e \\(2\\) \u89e3\u304c\u3068\u3082\u306b \\(0\\) \u4ee5\u4e0b\u3067\u3042\u308c\u3070\u3088\u3044\u306e\u3067, \u89e3\u3068\u4fc2\u6570\u306e\u95a2\u4fc2\u3088\u308a\r\n\\[\\begin{align}\r\n-\\dfrac{b}{a} \\leqq 0 \\ & \\text{\u304b\u3064} \\ \\dfrac{1}{a} \\geqq 0 \\\\\r\nab \\geq0 \\ & \\text{\u304b\u3064} \\ a \\gt 0 \\quad ( \\ \\text{\u2235} \\ a \\neq 0 \\ ) \\\\\r\n\\text{\u2234} \\quad a \\gt 0 \\ & \\text{\u304b\u3064} \\ b \\geqq 0 \\quad ... [3]\r\n\\end{align}\\]<\/li>\r\n<\/ul><\/li>\r\n<\/ol>\r\n<p>\u4ee5\u4e0a\u3088\u308a, \u6c42\u3081\u308b\u6761\u4ef6\u306f [1] \u307e\u305f\u306f [2] \u307e\u305f\u306f [3] \u3067\u3042\u308a, \u56f3\u793a\u3059\u308b\u3068, \u4e0b\u56f3\u659c\u7dda\u90e8\uff08\u5b9f\u7dda\u306e\u5883\u754c\u3068\u25cf\u3092\u542b\u307f, \u70b9\u7dda\u306e\u5883\u754c\u306f\u542b\u307e\u306a\u3044\uff09.<\/p>\r\n<img decoding=\"async\" src=\"\/nyushi\/wp-content\/uploads\/thr20210101.svg\" alt=\"thr20210101\" class=\"aligncenter size-full\" \/>\r\n","protected":false},"excerpt":{"rendered":"\\(a , b\\) \u3092\u5b9f\u6570\u3068\u3059\u308b. \u66f2\u7dda \\(y = ax^2 +bx +1\\) \u304c \\(x\\) \u8ef8\u306e\u6b63\u306e\u90e8\u5206\u3068\u5171\u6709\u70b9\u3092\u6301\u305f\u306a\u3044\u3088\u3046\u306a\u70b9 \\(( a , b )\\) \u306e\u9818\u57df\u3092\u56f3\u793a\u305b\u3088.","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[175],"tags":[148,165],"class_list":["post-2010","post","type-post","status-publish","format-standard","hentry","category-tohoku_r_2021","tag-tohoku_r","tag-165"],"_links":{"self":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts\/2010","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/comments?post=2010"}],"version-history":[{"count":0,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts\/2010\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/media?parent=2010"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/categories?post=2010"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/tags?post=2010"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}