{"id":1442,"date":"2017-11-01T14:49:49","date_gmt":"2017-11-01T06:49:49","guid":{"rendered":"http:\/\/www.xuehelp.cn\/?p=1442"},"modified":"2017-11-01T14:49:49","modified_gmt":"2017-11-01T06:49:49","slug":"%e5%ad%a6%e5%b8%ae%e7%be%a4%e4%b8%8a%e9%97%ae%e9%a2%98%e5%9c%86%e5%91%a8%e8%a7%92%e5%ae%9a%e7%90%86%e8%af%81%e6%98%8e%ef%bc%9a%e5%bd%93%e5%9c%86%e5%bf%83o%e5%9c%a8%e2%88%a0bac%e7%9a%84%e5%a4%96","status":"publish","type":"post","link":"http:\/\/www.xuehelp.cn\/index.php\/archives\/1442","title":{"rendered":"(\u5b66\u5e2e\u7fa4\u4e0a\u95ee\u9898)\u5706\u5468\u89d2\u5b9a\u7406\u8bc1\u660e\uff1a\u5f53\u5706\u5fc3O\u5728\u2220BAC\u7684\u5916\u90e8\u65f6\u600e\u4e48\u8bc1\u660e."},"content":{"rendered":"<p><a href=\"http:\/\/www.xuehelp.cn\/wp-content\/uploads\/2017\/11\/QQ\u56fe\u724720171101145249.png\" rel=\"attachment wp-att-1443\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-1443\" src=\"http:\/\/www.xuehelp.cn\/wp-content\/uploads\/2017\/11\/QQ\u56fe\u724720171101145249.png\" alt=\"QQ\u56fe\u724720171101145249\" width=\"216\" height=\"185\" srcset=\"http:\/\/www.xuehelp.cn\/wp-content\/uploads\/2017\/11\/QQ\u56fe\u724720171101145249.png 469w, http:\/\/www.xuehelp.cn\/wp-content\/uploads\/2017\/11\/QQ\u56fe\u724720171101145249-300x257.png 300w\" sizes=\"(max-width: 216px) 100vw, 216px\" \/><\/a><\/p>\n<p>\u5982\u56fe,\u5982\u9898\u00a0 .<br \/>\n\u5df2\u77e5\u5728\u2299O\u4e2d,\u2220BOC\u4e0e\u5706\u5468\u89d2\u2220BAC\u540c\u5bf9\u5f27BC,\u6c42\u8bc1\uff1a\u2220BOC=2\u2220BAC.<\/p>\n<p>\u63d0\u95ee\u8005\u6ce8\uff1a\u6211\u662f\u6d59\u6559\u7684\u4e66.\u524d\u4e24\u79cd\u60c5\u51b5\u6211\u90fd\u77e5\u9053\u600e\u4e48\u8bc1\u660e\u4e86.\u8fd9\u79cd\u60c5\u51b5\u4e66\u4e0a\u7684\u90a3\u79cd\u592a\u80cc\u4e86,\u8003\u8bd5\u7684\u65f6\u5019\u627e4\u5bf9\u5f27\u52a0\u51cf\u7684\u65b9\u6cd5,\u592a\u96be\u5199\u800c\u4e14\u5bb9\u6613\u9519.\u4e0d\u8981\u6284\u767e\u5ea6\u7684,\u90a3\u4e2a\u6211\u770b\u8fc7\u4e86\uff08\u5c31\u662f\u73b0\u5728\u6211\u4eec\u4e66\u4e0a\u7684\u90a3\u79cd\uff09.\u53ef\u4ee5\u7528\u7b80\u5355\u4e00\u70b9\u7684\u65b9\u6cd5\u8bc1\u5417.\u5404\u4f4d\u5927\u795e\u8bb0\u5f97\u8bc1\u660e\u5199\u7406\u7531\u554a.\u6211\u51e0\u4f55\u6709\u70b9\u5f31,<!--more--><\/p>\n<p>\u8bc1\u660e\uff1a\u2235OC=OA \u2234\u2220OCA=\u2220CAO<br \/>\n\u2235OB=OA \u2234\u2220OBA=\u2220OAB<br \/>\n\u2234\u2220DOC=\u2220OCA+\u2220CAO=2\u2220CAO<br \/>\n\u2234\u2220DOB=\u2220OBA+\u2220OAB=2\u2220OAB<br \/>\n\u2234\u2220DOC-\u2220DOB=\u2220BOC=2\u2220CAO-2\u2220OAB=2(\u2220CAO-\u2220OAB)=2\u2220BAC<br \/>\n\u2234\u2220BOC=2\u2220BAC<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u56fe,\u5982\u9898\u00a0 . \u5df2\u77e5\u5728\u2299O\u4e2d,\u2220BOC\u4e0e\u5706\u5468\u89d2\u2220BAC\u540c\u5bf9\u5f27BC,\u6c42\u8bc1\uff1a\u2220BOC=2\u2220BAC. \u63d0\u95ee\u8005\u6ce8\uff1a\u6211 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[504],"_links":{"self":[{"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/posts\/1442"}],"collection":[{"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1442"}],"version-history":[{"count":1,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/posts\/1442\/revisions"}],"predecessor-version":[{"id":1444,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/posts\/1442\/revisions\/1444"}],"wp:attachment":[{"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1442"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.xuehelp.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}