{"id":325,"date":"2025-03-27T21:19:00","date_gmt":"2025-03-27T13:19:00","guid":{"rendered":"https:\/\/tilearn.space\/?p=325"},"modified":"2025-03-27T21:39:26","modified_gmt":"2025-03-27T13:39:26","slug":"2024%e5%b1%8a%e5%ae%9d%e5%b1%b1%e5%8c%ba%e5%88%9d%e4%b8%89%e4%ba%8c%e6%a8%a1%e6%95%b0%e5%ad%a6%e8%af%95%e5%8d%b7%e7%b2%be%e8%ae%b2%ef%bc%88%e7%ac%ac18%e9%a2%98%ef%bc%89","status":"publish","type":"post","link":"https:\/\/tilearn.space\/?p=325","title":{"rendered":"2024\u5c4a\u5b9d\u5c71\u533a\u521d\u4e09\u4e8c\u6a21\u6570\u5b66\u8bd5\u5377\u7cbe\u8bb2\uff08\u7b2c18\u9898\uff09"},"content":{"rendered":"
\n

18. \u5982\u56fe\uff0c\u83f1\u5f62ABCD\u7684\u8fb9\u957f\u4e3a5\uff0c\\(\\cos B = \\frac{4}{5}\\)\uff0cE\u662f\u8fb9CD\u4e0a\u4e00\u70b9\uff08\u4e0d\u4e0e\u70b9C\u3001D\u91cd\u5408\uff09\uff0c\u628a\u25b3ADE\u6cbf\u7740\u76f4\u7ebfAE\u7ffb\u6298\uff0c\u5982\u679c\u70b9D\u843d\u5728\u83f1\u5f62\u4e00\u8fb9\u7684\u5ef6\u957f\u7ebf\u4e0a\uff0c\u90a3\u4e48CE\u7684\u957f\u4e3a________\u3002<\/h3>\n

\"f1026196fd22af07d04bcdad945a5316\"<\/p>\n

\u8be6\u7ec6\u89e3\u7b54\uff1a<\/h3>\n

\"c0e4835117dcbf0e6c0618f753b11723\"<\/p>\n

\u89e3\uff1a\u8fc7\u70b9A\u4f5cAH\u22a5BC\u4e8eH\uff0c\u8fc7\u70b9E\u4f5cEG\u22a5CF\u4e8eG\uff0c\u70b9D\u4e0e\u70b9F\u91cd\u5408\uff0c\u5982\u56fe\u3002<\/p>\n

\u7531\u6298\u53e0\u5f97\uff1aAF=AD=AB=5\uff0c<\/p>\n

\u2234BH=AH\uff0c<\/p>\n

\u2235\\(\\cos \\angle B = \\frac{4}{5}\\)\uff0c<\/p>\n

\u2234BH=4\uff0c<\/p>\n

\u2234BF=2BH=8\uff0c<\/p>\n

\u2234FC=AF-AC=8-5=3\uff0c<\/p>\n

\u2235\u56db\u8fb9\u5f62ABCD\u662f\u83f1\u5f62\uff0c<\/p>\n

\u2234CD\/\/AB\uff0c<\/p>\n

\u2234\u2220DCF=\u2220B\uff0c<\/p>\n

\u2235\\(\\cos \\angle DCF = \\cos \\angle B = \\frac{4}{5}\\)\uff0c<\/p>\n

\u8bbeCG=4y\uff0c\u5219CE=5y\uff0cFG=CF-CG=3-4y\uff0c<\/p>\n

\u5728Rt\u25b3CEG\u4e2d\uff0c\u7531\u52fe\u80a1\u5b9a\u7406\u5f97\uff1a\\((3-4y)^2 + (3y)^2 = (5-5y)^2\\)\uff0c<\/p>\n

\u89e3\u5f97\uff1ay=\\(\\frac{8}{13}\\)\uff0c<\/p>\n

\u2234CE=5y=\\(\\frac{40}{13}\\)\u3002<\/p>\n

\u8fd8\u6709\u7b2c\u4e8c\u4e2a\u7b54\u6848\u5c31\u662f\u6298\u5728CD\u7684\u5ef6\u957f\u7ebf\u4e0a\u5f62\u6210\u7b49\u8170\uff0c\u7b80\u5355\u8ba1\u7b97\u53ef\u77e5\u7b54\u6848\u662fCE=1<\/p>\n

\u76f8\u5173\u77e5\u8bc6\u70b9\u590d\u4e60\uff1a<\/h3>\n
    \n
  1. \u83f1\u5f62\u7684\u6027\u8d28\uff1a\u5bf9\u89d2\u7ebf\u4e92\u76f8\u5782\u76f4\u5e73\u5206\uff0c\u90bb\u8fb9\u76f8\u7b49\u3002<\/li>\n
  2. \u52fe\u80a1\u5b9a\u7406\uff1a\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u659c\u8fb9\u7684\u5e73\u65b9\u7b49\u4e8e\u4e24\u76f4\u89d2\u8fb9\u7684\u5e73\u65b9\u548c\u3002<\/li>\n
  3. \u4f59\u5f26\u51fd\u6570\uff1a\u5728\u76f4\u89d2\u4e09\u89d2\u5f62\u4e2d\uff0c\u4e00\u4e2a\u9510\u89d2\u7684\u4f59\u5f26\u503c\u7b49\u4e8e\u8be5\u89d2\u76f8\u90bb\u8fb9\u4e0e\u659c\u8fb9\u7684\u6bd4\u503c\u3002<\/li>\n<\/ol>\n

    \u6613\u9519\u63d0\u793a\u548c\u62d3\u5c55\uff1a<\/h3>\n
      \n
    1. \u5728\u89e3\u9898\u8fc7\u7a0b\u4e2d\uff0c\u8981\u6ce8\u610f\u533a\u5206\u4e0d\u540c\u7684\u51e0\u4f55\u56fe\u5f62\u53ca\u5176\u6027\u8d28\uff0c\u6b63\u786e\u8fd0\u7528\u52fe\u80a1\u5b9a\u7406\u548c\u4f59\u5f26\u51fd\u6570\u3002<\/li>\n
    2. \u5bf9\u4e8e\u6298\u53e0\u95ee\u9898\uff0c\u8981\u7406\u89e3\u6298\u53e0\u524d\u540e\u56fe\u5f62\u7684\u4f4d\u7f6e\u5173\u7cfb\uff0c\u6b63\u786e\u627e\u51fa\u5bf9\u5e94\u70b9\u3002<\/li>\n
    3. \u89e3\u65b9\u7a0b\u65f6\uff0c\u8981\u6ce8\u610f\u68c0\u9a8c\u89e3\u7684\u5408\u7406\u6027\uff0c\u786e\u4fdd\u89e3\u7b26\u5408\u9898\u610f\u3002<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

      18. \u5982\u56fe\uff0c\u83f1\u5f62ABCD\u7684\u8fb9\u957f\u4e3a5\uff0c\\(\\cos B = \\frac{4}{5}\\)\uff0cE\u662f\u8fb9CD\u4e0a\u4e00\u70b9\uff08\u4e0d\u4e0e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-325","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/posts\/325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tilearn.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=325"}],"version-history":[{"count":6,"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/posts\/325\/revisions"}],"predecessor-version":[{"id":333,"href":"https:\/\/tilearn.space\/index.php?rest_route=\/wp\/v2\/posts\/325\/revisions\/333"}],"wp:attachment":[{"href":"https:\/\/tilearn.space\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tilearn.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tilearn.space\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}