推理填空:如图,已知
,
,可推得
.理由如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e33eccaf-c3e7-4fd8-a94f-18c70b96a1c6.png?resizew=121)
∵
(已知),且
( )
∴
(等量代换)
∴
( )
∴
(两直线平行,同位角相等)
又∵
(已知),
∴
(等量代换)
∴
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e33eccaf-c3e7-4fd8-a94f-18c70b96a1c6.png?resizew=121)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e26895bd023fc7f392b30cf7d05511.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e656bb343181eef14d4297b84af5dd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f4db16b8c19d60afe5e5ef9344132f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6080f91798816e56990a89d2f91c091a.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
18-19七年级下·陕西安康·期中 查看更多[34]
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更新时间:2023-02-22 13:41:22
|
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】如图,在长方形
中,
,
,
垂直平分
分别交
,
于
,
,求证:
.(请你将下面的推理过程中的横线空白处补充完整)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/587cf3f6-15c0-4d0c-82c1-cd4deca160c5.png?resizew=157)
解:∵
(______________),
∴
(______________).
∵
垂直平分
(已知),
∴
(线段垂直平分线的定义).
在
和
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2487b1eae65243a4f9be8b764557d88.png)
∴
(_________________).
∴
(________________________).
∵
垂直平分
(已知),
∴
(线段垂直平分线的性质)
∴
(_________________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd27d06065f2ddd5cf5ccbe5bef48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/587cf3f6-15c0-4d0c-82c1-cd4deca160c5.png?resizew=157)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d069ebe5f7d0ab61763a0112af2189e.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0944865f14b13a772526c4cae4f29c99.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb54188bbb69622b5c351e2586c3f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f4acffd2f9d6ab583fc2f732486c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2487b1eae65243a4f9be8b764557d88.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1641b30d8aa9c7459dc6a101b932f089.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049ba02a6816033ade98e679a59a3b24.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e386961ae92ae80a926b593ebde601.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd27d06065f2ddd5cf5ccbe5bef48.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】如图,直线CE,BF被直线
,
所截,CE
BF且
.
![](https://img.xkw.com/dksih/QBM/2022/7/10/3019376551157760/3025149328588800/STEM/f77d027b88a147c4b2b0e5ca4a265f7f.png?resizew=272)
(1)求证:
;
(2)过点
作
于点A,以点B为顶点作
,BD交
于点D,连接AD.
①补全图形;
②若DA平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2022/7/10/3019376551157760/3025149328588800/STEM/f77d027b88a147c4b2b0e5ca4a265f7f.png?resizew=272)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027830fc47290062692964077ee481e4.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8de0be5c76e57a5a23a8c662ff46a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ecd8b6dc67018b19fe7fd4e3471bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
①补全图形;
②若DA平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,已知
,
,
.
;
(2)试求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4722292f669ba559e82b0190a4152090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3dfa34047cd46b6806f220012c08b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15a4c44e9e63c5aae67bed1e4f04b50.png)
(2)试求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b69923f7d2733e929c02575e7eed623.png)
您最近一年使用:0次