如图,在正方形
中,点E,F分别在边
,
上,且
,
与
相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9c693bbc-ed16-4c2d-8473-32f3f6bd87dc.png?resizew=156)
(1)求证:
;
(2)求证:
;
(3)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9c693bbc-ed16-4c2d-8473-32f3f6bd87dc.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327d1c2faee1d33db246ab52e43e4f9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
更新时间:2021-02-06 10:02:10
|
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解答题-证明题
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【推荐1】如图,在△ABC中,点D是BC上一点, 且BD=DA=AC.把边AB绕着点A顺时针旋转一定角度得到∠BAE,连接DE,交AB于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/2c270d96-ff93-45d1-92d5-be66b00a145f.png?resizew=137)
(1)若∠B=α,请用含α的式子表示∠C;
(2)若∠CAD=∠BAE,求证:DA平分∠CDE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/2c270d96-ff93-45d1-92d5-be66b00a145f.png?resizew=137)
(1)若∠B=α,请用含α的式子表示∠C;
(2)若∠CAD=∠BAE,求证:DA平分∠CDE.
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【推荐2】如图,在
中,
,
,AD与BE相交于点P,
于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/9a0a8602-3df0-4256-b367-1f00a1b4a0a0.png?resizew=181)
(1)求证:
;
(2)求
的度数:
(3)若
,求PQ的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1af71094b0522a0df6c7fae1580e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77f2b19c52a8ef7d6d0cbdc43da861d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/9a0a8602-3df0-4256-b367-1f00a1b4a0a0.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a764971824729ffb27922b7a86b402a0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e580be92dd9f7b8eadec142b59317d5.png)
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【推荐1】如图,已知AD垂直平分线段BC,交BC于点D,连接AB,AC,且∠C=60°,E为△ABC外一点,连接AE,BE和DE,DE交AB于点F,且AB平分∠EAD,ED=EA.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/24390191-c9aa-4bf4-b65f-bc74497003eb.png?resizew=184)
(1)求∠EAD的度数;
(2)求证:AF⊥DE;
(3)试判断BF与BC之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/24390191-c9aa-4bf4-b65f-bc74497003eb.png?resizew=184)
(1)求∠EAD的度数;
(2)求证:AF⊥DE;
(3)试判断BF与BC之间的数量关系,并说明理由.
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解题方法
【推荐2】求证:在直角三角形中,若一个锐角等于30°,则它所对的直角边等于斜边的一半.要求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/cb9069db-9689-41b6-80c6-e7c0829b45b8.png?resizew=154)
(1)根据给出的线段
及∠B,以线段
为直角边,在给出的图形上用尺规作出
的斜边
,使得
,保留作图痕迹,不写作法;
(2)根据(1)中所作的图形,写出已知、求证和证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/cb9069db-9689-41b6-80c6-e7c0829b45b8.png?resizew=154)
(1)根据给出的线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
(2)根据(1)中所作的图形,写出已知、求证和证明过程.
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【推荐1】综合与实践
【情境呈现】如图1,将两个正方形纸片
和
放置在一起.若固定正方形
,将正方形
绕着点A旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/bf2c330c-cd5d-47c4-82b3-13044ca5dd67.png?resizew=411)
(1)【数学思考】如图1,当点E在
边上,点G在
边上时,线段
与
的数量关系是 ,位置关系是 .
(2)如图2,是将正方形
绕着点A逆时针旋转
度得到的,则(1)中的结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
(3)【拓展探究】如图3,若点D,E,G在同一条直线上,且
,求线段
的长度(直接写出答案).
【情境呈现】如图1,将两个正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/bf2c330c-cd5d-47c4-82b3-13044ca5dd67.png?resizew=411)
(1)【数学思考】如图1,当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)如图2,是将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)【拓展探究】如图3,若点D,E,G在同一条直线上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835eae87518d34a66166cb6054c65fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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名校
【推荐2】在正方形ABCD中,AD=CD,∠ADC=90°,点E是平面内一点,将线段DE绕点D逆时针旋转90°得到线段DF,连接EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/31e331bb-8c16-4cbb-8c21-75c956421254.png?resizew=323)
(1)如图1,若点E在AB上运动,连接CF,当AB=4,AE=1时,BF=__,EF=__;
(2)如图2,若EF恰好经过点C,连接AE,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/31e331bb-8c16-4cbb-8c21-75c956421254.png?resizew=323)
(1)如图1,若点E在AB上运动,连接CF,当AB=4,AE=1时,BF=__,EF=__;
(2)如图2,若EF恰好经过点C,连接AE,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ff7be217e8bbf5362e085f95cd7727.png)
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