如图,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1fc6a7e43712a09db5231d8f260b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f700adc66aee129674b192830fb1ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/0ae62ea2-3dbb-47e6-b415-5bd0a04f1253.png?resizew=168)
更新时间:2023-07-17 08:41:27
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解答题-问答题
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适中
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【推荐1】请完成下面的解答过程:
如图,点
在
的一边
上,过点
的直线
,
.
当
时,求
的度数.
解:∵
,
∴
__________
(____________________).
∵
,
,
三点共线,
∴
.
∵
,
∴
__________
.
∵
,
∴
__________(____________________).
__________
.
如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8c84d43d19a0956046844be64d8d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf14d16fe2051fe152e86fc48783b6ca.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab5c45a72849d2cae1d65b282b5bd19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97285f9b02878e22a071e97fdb3f8a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/84e2f0e8-c8af-430e-93cc-5f8dfe60e4ef.png?resizew=186)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf14d16fe2051fe152e86fc48783b6ca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea54600e519476a062079952697cfc64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcdfee81095a16e1eebda454e5dcf10.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab5c45a72849d2cae1d65b282b5bd19.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1b8cce75cc358cfec0422e5bc4f262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8c84d43d19a0956046844be64d8d50.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41115968a9340c03359140b38aadb278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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【推荐2】如图所示,
处在A处的南偏西
方向上,
处在A处的南偏东
方向,
处在
处的北偏东
,求
是多少度?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1845ed03ec08feac9adee161aab3449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31a14bd2a972f43d7a26a99589ad083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/a56fdabc-dee8-4cbb-b83e-a672f435d12b.png?resizew=143)
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解答题-证明题
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【推荐1】如图,CD∥AB,∠DCB=70°,∠CBF=20°,∠EFB=130°,
(1)问直线EF与AB有怎样的位置关系?加以证明;
(2)若∠CEF=70°,求∠ACB的度数.
(1)问直线EF与AB有怎样的位置关系?加以证明;
(2)若∠CEF=70°,求∠ACB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/3f65b512-e7c8-49c7-ae29-1d933ebbaa70.png?resizew=154)
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