如图,已知点
,
,
,
在一条直线上,
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/1/18/3155380364853248/3164137554182144/STEM/1b69114e70e3414a82c4b6601a3b2d2e.png?resizew=168)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f48d1cbd6610c5daa16ea33deab9406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546f5e3bf6a3b60f85ea730a6cd7b36e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://img.xkw.com/dksih/QBM/2023/1/18/3155380364853248/3164137554182144/STEM/1b69114e70e3414a82c4b6601a3b2d2e.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cc39bd5f811ee710c8a9fb73d57791.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1004d2e69ca0f5bb25f4eae3957386b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1de08f3c0eecd1dd1885d5cc3663574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
更新时间:2023-01-30 20:37:14
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【推荐1】完成下面的证明:
如图,已知∠1、∠2互为补角,且∠3=∠B,
求证:∠AED=∠ACB.
证明:∵∠1+∠2=180°,∠2+∠4=180°
∴∠1=∠4 (______)
∴AB∥EF(_______)
∴∠3=______(______)
又∠3=∠B
∴∠B=_______(_______)
∴DE∥BC (________)
∴∠AED=∠ACB (_______)
如图,已知∠1、∠2互为补角,且∠3=∠B,
求证:∠AED=∠ACB.
证明:∵∠1+∠2=180°,∠2+∠4=180°
∴∠1=∠4 (______)
∴AB∥EF(_______)
∴∠3=______(______)
又∠3=∠B
∴∠B=_______(_______)
∴DE∥BC (________)
∴∠AED=∠ACB (_______)
![](https://img.xkw.com/dksih/QBM/2020/4/28/2450963097960448/2453350642352128/STEM/9040e00eee6845e0bcb140f3ec132306.png?resizew=170)
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【推荐2】如图,已知
,
与
相交于点
,从点
引一条射线
交线段
于点
,若
,
,求证:
.
证明:
(已知),
________
(两直线平行,同旁内角互补),
又
(已知),
(________),
________(同位角相等,两直线平行),
________(________),
∵
(已知),
(________),
(已知),
(________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb3e70c0d0c26b8d0743e7e7a605ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a87b4bda65f7080ed398ad23edf551b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91a6fff9a779065091063b10abc0aca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/2dec6ceb-d498-4930-9779-5029566f47b7.png?resizew=159)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38a9d7a0b5de96fbbf7acb84ef26dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91071f3cf3a66226bb47caa2e7b6b7f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a709811204b627d272199d1726040894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c74feaad8f3adde048950a62528b22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acd8b1f3b870fd22dee057f5fcc04c5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c623d9736934b9834db1507ec8a5065e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f93a0f082d2d196eb45142330809aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d56e691ac3f58dc0e560c8cea7aa13.png)
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【推荐1】如图,DE⊥AB,CF⊥AB,垂足分别是点E、F,DE=CF,AE=BF,求证:AC
BD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876479927189504/1882949354741760/STEM/42c385eb31d441d6bb33375d81a7529d.png?resizew=130)
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【推荐2】如图四边形ABCD是正方形,点E、K分别在BC,AB上,点G在BA的延长线上,且CE=BK=AG.以线段DE、DG为边作□DEFG.
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740215810637824/2741842851758080/STEM/b7b659e2-d877-4ddb-99ad-3fba0557e2a7.png)
(1)求证:DE=DG,且DE⊥DG.
(2)连接KF,猜想四边形CEFK是怎样的特殊四边形,并证明你的猜想.
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740215810637824/2741842851758080/STEM/b7b659e2-d877-4ddb-99ad-3fba0557e2a7.png)
(1)求证:DE=DG,且DE⊥DG.
(2)连接KF,猜想四边形CEFK是怎样的特殊四边形,并证明你的猜想.
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