如图,点B,C在线段
的异侧,点E,F分别是线段
,
上的点,连接
交
于点G,连接
交
于点H.已知
,
.
;
(2)若
,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d373f72060450fe8f7ec665cb09426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddc4ca1fe43ccd8e67dbafc7843d2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95312bde51ced84a470efc95f90fdf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc216fb801d373dc0f3b0bd4a6a3c27d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
更新时间:2024-05-25 17:56:44
|
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【推荐1】如图,直线
,
相交于点
,
平分
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,直线
、
相交于点
,
,
.
的余角______;
(2)如果
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701420de150f578458e463b56ff3b97f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
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【推荐1】如图,已知
,
.
与
相等吗?请说明理由;
(2)若
,
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c08557fb973646e064dd6e9ed669fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50e100d38ba4236cbeb34aad1255dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29b5f0bb303b0fb0db0ec020d2f008a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
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【推荐2】小头爸爸”为了检查“大头儿子”对平行线的条件与性质这部分知识的掌握情况,给他出了一道题:如图,AB//DE,∠B=80°,CM平分∠BCD,CN⊥CM,求∠NCE的度数.“大头儿稍加思索就做出来了,你知道他是怎样解的吗?请把你的推理过程写下来吧.
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】如图,已知
,
,D,G 分别是垂足,
,
求证:
.
证明:
,
,
,
( ),
( ),
,
,
( ),
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c13ab7f17263c4e6163d960f1c5060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d7d59ef99c76e335b81a22bf6abedb.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f4920c373f7147fc395321181a0e52.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6900a9b502cca3b557061498b38bb539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c13ab7f17263c4e6163d960f1c5060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b259fc354f6d87f7a50ad76ec1988141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aba7e1fe7e6fc26f5eae4ce4f5a728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401814fb1e410facefbf16c12a880efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12888f544ab5b97c8524985919571b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28a0ba0b83538eee6fce08f6b40f7c0.png)
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【推荐2】如图,已知
,
,求证:
.请将下面的推理过程补充完整.
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583128517001216/2585243653521408/STEM/510634e8-aad0-4aa6-81ef-698e2b1bd6c0.png?resizew=166)
证明:∵
(已知)
( )
∴
,
∴______∥______( )
∴
______( )
∵
(已知)
∴
______( )
∴
(内错角相等,两直线平行)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958b45552f9fa1a60016483bd8246be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583128517001216/2585243653521408/STEM/510634e8-aad0-4aa6-81ef-698e2b1bd6c0.png?resizew=166)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85b53a74e2a952b581700c83bbcd25.png)
∴______∥______( )
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958b45552f9fa1a60016483bd8246be9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88504784a3def38879c4e46458acfee.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
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