{"id":1240,"date":"2010-06-16T09:49:24","date_gmt":"2010-06-16T01:49:24","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/2341\/2010\/06\/16\/%e4%b8%80%e5%85%83%e4%b8%80%e6%ac%a1%e4%b8%8d%e7%ad%89%e5%bc%8f%e7%9a%84%e6%87%89%e7%94%a8%e5%95%8f%e9%a1%8c1\/"},"modified":"2010-06-16T09:49:24","modified_gmt":"2010-06-16T01:49:24","slug":"%e4%b8%80%e5%85%83%e4%b8%80%e6%ac%a1%e4%b8%8d%e7%ad%89%e5%bc%8f%e7%9a%84%e6%87%89%e7%94%a8%e5%95%8f%e9%a1%8c1","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/2341\/2010\/06\/16\/%e4%b8%80%e5%85%83%e4%b8%80%e6%ac%a1%e4%b8%8d%e7%ad%89%e5%bc%8f%e7%9a%84%e6%87%89%e7%94%a8%e5%95%8f%e9%a1%8c1\/","title":{"rendered":"\u4e00\u5143\u4e00\u6b21\u4e0d\u7b49\u5f0f\u7684\u61c9\u7528\u554f\u984c#1"},"content":{"rendered":"

\n\u5b78\u751f\u554f\u6211\u7684\u984c\u76ee, \u88dc\u7fd2\u73ed\u8b1b\u7fa9\u5167\u7684\u984c\u76ee, \u4e00\u6642\u9593\u6c92\u6709\u7acb\u5373\u89e3\u51fa\u4f86, \u4ee5\u524d\u66fe\u898b\u904e\u9019\u7a2e\u984c\u76ee, \u592a\u4e45\u6c92\u63a5\u89f8\u5c31\u751f\u758f\u4e86. \u6240\u4ee5\u628a\u89e3\u6cd5\u8a18\u9304\u5728\u9019\u88e1, \u4e00\u984c\u5169\u89e3\u3002\n<\/p>\n

\nQ: \u68a8\u5b50\u6bcf\u7bb1\u88dd 9 \u500b, \u9918 4 \u500b. \u82e5\u6bcf\u7bb1\u88dd 11 \u500b, \u6700\u5f8c\u4e00\u7bb1\u88dd\u4e0d\u6eff 11 \u500b. \u554f\u68a8\u5b50\u6700\u591a\u6709\u5e7e\u500b, \u6700\u5c11\u6709\u5e7e\u500b?\n<\/p>\n

\nA\uff1a\u5be9\u984c, \u984c\u76ee\u7684\u610f\u601d\u662f, \u68a8\u5b50\u6578\u91cf\u56fa\u5b9a, \u800c\u4e14\u7528\u5169\u7a2e\u4e0d\u540c\u7684\u88dd\u6cd5, \u7528\u7684\u662f\u540c\u6a23\u591a\u7684\u7bb1\u5b50. \u56e0\u6b64\u5047\u8a2d\u672a\u77e5\u6578\u53ef\u4ee5\u6709\u5169\u500b\u65b9\u5411, \u4e00\u7a2e\u662f\u5047\u8a2d\u7bb1\u5b50\u6578\u91cf, \u4e00\u7a2e\u662f\u5047\u8a2d\u68a8\u5b50\u7e3d\u6578.\n<\/p>\n

\n[@more@]\n<\/p>\n

\n[\u89e31]\n<\/p>\n

\n\u5047\u8a2d\u88dd x \u7bb1
\n\u6bcf\u7bb1\u88dd 11 \u500b, \u5c11\u88dd\u4e00\u7bb1\u5f8c, \u68a8\u5b50\u7684\u7e3d\u6578\u70ba 11(x-1) → \u88dd\u592a\u5c11
\n\u539f\u672c\u68a8\u5b50\u7684\u7e3d\u6578\u70ba 9x+4 → \u88dd\u525b\u597d
\n\u6bcf\u7bb1\u88dd 11 \u500b, \u6bcf\u7bb1\u90fd\u88dd\u6eff\u7684\u60c5\u6cc1\u4e0b, \u68a8\u5b50\u7684\u7e3d\u6578\u70ba 11x → \u88dd\u592a\u591a
\n\u6240\u4ee5\u53ef\u4ee5\u5217\u4e0d\u7b49\u5f0f\u5982\u4e0b:\n<\/p>\n

\n11(x-1) < 9x + 4 < 11x
\n11x – 11 < 9x + 4 < 11x\n<\/p>\n

\n\u5c55\u958b\u4e4b\u5f8c, \u5206\u5169\u90e8\u4efd\u89e3\u984c:\n<\/p>\n

\n(1) 11x – 11 < 9x + 4, \u79fb\u9805\u6574\u7406\u5f97 2x < 15, \u6240\u4ee5 x < 7.5
\n(2) 9x + 4 < 11x, \u79fb\u9805\u6574\u7406\u5f97 4 < 2x, \u6240\u4ee5 2 < x\n<\/p>\n

\n\u5408\u4f75\u5f97 2 < x < 7.5, \u6240\u4ee5\u68a8\u5b50\u7684\u6578\u91cf\u4ecb\u65bc 3 \u7bb1\u5230 7 \u7bb1\u4e4b\u9593.
\n\u6700\u5c11 3 \u7bb1, \u68a8\u5b50\u6578 9×3+4 = 31 (\u500b)
\n\u6700\u591a 7 \u7bb1, \u68a8\u5b50\u6578 9×7+4 = 67 (\u500b)\n<\/p>\n

\n[\u89e32]\n<\/p>\n

\n\u5047\u8a2d\u68a8\u5b50\u7e3d\u6578 x \u9846,
\n(x-4)÷9  (\u7b97\u51fa\u6bcf\u7bb1 9 \u9846\u7684\u60c5\u5f62\u4e0b\u6709\u5e7e\u7bb1)
\n(x-4)÷9×11 (\u4ee3\u8868\u6bcf\u7bb1 11 \u9846\u88dd\u6eff\u7684\u60c5\u6cc1\u4e0b\u6709\u5e7e\u9846\u68a8\u5b50)
\n(x-4)÷9×11 – x (\u56e0\u70ba\u6700\u5f8c\u4e00\u7bb1\u672c\u4f86\u88dd\u4e0d\u6eff 11 \u500b, \u4f46\u662f\u591a\u88dd\u4e86\u4e00\u4e9b, \u6240\u4ee5\u6263\u6389\u68a8\u5b50\u539f\u672c\u7684\u7e3d\u6578\u5f8c, \u591a\u88dd\u7684\u90a3\u4e9b\u68a8\u5b50\u6578\u91cf\u5728 0 \u548c 11 \u4e4b\u9593)
\n\u6240\u4ee5\u53ef\u4ee5\u5217\u51fa\u4e0b\u5f0f:
\n\u53ef\u5217\u51fa\u4e0d\u7b49\u5f0f\uff1a0 < (x-4)÷9×11 – x < 11 
\n\u8a08\u7b97\u53ef\u5f97 22 < x < 71.5
\n\u4f46\u662f\u6700\u5c11\u7684\u9846\u6578\u4e26\u4e0d\u662f 23, \u56e0\u70ba\u9084\u8981\u7b26\u5408\u984c\u610f, \u6bcf\u7bb1\u88dd 9 \u500b\u9918 4 \u500b, \u56e0\u6b64
\n\u6700\u5c11 9×3+4 = 27+4 = 31 (\u500b)
\n\u6700\u591a 9×7+4 = 63+4 = 67 (\u500b)<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5b78\u751f\u554f\u6211\u7684\u984c\u76ee, \u88dc\u7fd2\u73ed\u8b1b\u7fa9\u5167\u7684\u984c\u76ee, \u4e00\u6642\u9593\u6c92\u6709\u7acb\u5373\u89e3\u51fa\u4f86, \u4ee5\u524d\u66fe\u898b\u904e\u9019\u7a2e\u984c\u76ee, \u592a\u4e45\u6c92\u63a5\u89f8\u5c31\u751f\u758f\u4e86. \u6240… » \u95b1\u8b80\u5168\u6587<\/a><\/p>\n","protected":false},"author":76,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-1240","post","type-post","status-publish","format-standard","hentry","category-c-17790"],"meta_key":{"lt_post_id":["101442"],"_jetpack_related_posts_cache":["a:1:{s:32:\"8f6677c9d6b0f903e98ad32ec61f8deb\";a:2:{s:7:\"expires\";i:1577704891;s:7:\"payload\";a:0:{}}}"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/posts\/1240"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/users\/76"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/comments?post=1240"}],"version-history":[{"count":0,"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/posts\/1240\/revisions"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/media?parent=1240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/categories?post=1240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/2341\/wp-json\/wp\/v2\/tags?post=1240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}