如图1,已知:△ABD∽△ACE,∠ABD=∠ACE=90°,连接DE,O是DE的中点.
(1)连接OC,OB 求证:OB=OC;
(2)将△ACE绕顶点A逆时针旋转到图2的位置,过点E作EM∥AD交射线AB于点M,交射线AC于点N,连接DM,BC. 若DE的中点O恰好在AB上.
①求证:△ADM∽△AEN
②求证:BC∥AD
③若AC=BD=3,AB=4,△ACE绕顶点A旋转的过程中,是否存在四边形ADME矩形的情况?如果存在,直接写出此时BC的值,若不存在说明理由.
(1)连接OC,OB 求证:OB=OC;
(2)将△ACE绕顶点A逆时针旋转到图2的位置,过点E作EM∥AD交射线AB于点M,交射线AC于点N,连接DM,BC. 若DE的中点O恰好在AB上.
①求证:△ADM∽△AEN
②求证:BC∥AD
③若AC=BD=3,AB=4,△ACE绕顶点A旋转的过程中,是否存在四边形ADME矩形的情况?如果存在,直接写出此时BC的值,若不存在说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/27/2169382297034752/2171167637471232/STEM/d927798aef3b496a96bbd15f0fb0bd44.png?resizew=408)
18-19九年级下·江西上饶·阶段练习 查看更多[2]
更新时间:2019-03-29 22:34:46
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,点E在
上,连接BE,并延长
至点F,连接
,
,
,
,连接
交
于点G,若
.
(1)求证:
;
(2)求证:
垂直平分线段
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3214c853ea2268ef6c434fb28f0298d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5862fd2c5af208d568209ed6bd780776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b832a541b0c06d650c0cd10b176226.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/7062a70c-4fe6-450e-8333-e71055a402d3.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f405c8e5f841e1a4c0951c9abbee4678.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在平行四边形
中,连接对角线
,
的角平分线交
于点E.
的角平分线,交
于点F.(保留作图痕迹,不写作法)
(2)在(1)问所作的图形中,连接
、
,求证:四边形
是平行四边形.
证明:
∵四边形
是平行四边形,
∴
,
,
①__________
∴
.
又∵
、
分别平分
、
.
∴
,
.
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fb624bcae7cf99ce00e0712f0fd892.png)
在
和
中:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1846114289f50d3e83c127e14dd04ea2.png)
∴
,
∴
,
③__________
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3834f58a461319ff4ee34f7e98c826e.png)
∴④____________________
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550b15375a54ce849585b60bc42d2dd1.png)
∴
,
.
∴四边形
是平行四边形(⑤____________________)(填依据)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)在(1)问所作的图形中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
证明:
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e1dc3473ec67beb52aaaba5645cacb.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95efaa2bb4dce0f63f4a23e0f29c5aa0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c11ddc8ae69717640df7f033cbb9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7247142f57c83a01d0b7151990e38817.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fb624bcae7cf99ce00e0712f0fd892.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1846114289f50d3e83c127e14dd04ea2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a0bbb4f071b38e625d71ef0f3de3b1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63783f365e666ace307cadcaba60fa.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3834f58a461319ff4ee34f7e98c826e.png)
∴④____________________
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550b15375a54ce849585b60bc42d2dd1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550b15375a54ce849585b60bc42d2dd1.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是等边三角形,
为边
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/5da1e69b-5544-4daa-b535-238d13755345.png?resizew=116)
(1)求证:
.
(2)请判断
是什么三角形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1178e0b1cb626b143805e363e72132a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/5da1e69b-5544-4daa-b535-238d13755345.png?resizew=116)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c06e42bb890fa8dd121dd7dcb761420.png)
(2)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知在
中,高线
,
相交于点H,点F是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/48cb3eec-0302-4272-8cca-19ef1db959d8.png?resizew=174)
(1)求证:
;
(2)若
,则求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/48cb3eec-0302-4272-8cca-19ef1db959d8.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7443ff12716483306a7ee1775003d27.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0ee3db4954e8858303c2ef19307e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】已知:在
中,
,
,将
绕点
顺时针旋转一定的角度
得到
,点
、
的对应点分别是
、
.
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753603242254336/2796624893460480/STEM/25c391b3-1920-4e56-8e4e-aaa212b323f2.png?resizew=526)
(1)如图1,若
时,连接
,求证:
;
(2)如图2,当点
恰好在
上时,求
的度数;
(3)如图3,点
、
的坐标分别是
,
,点
是线段
上的一个动点,点
是线段
上的一个动点,是否存在这样的点
、
使得
为等腰三角形且
为直角三角形?若存在,请求出满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753603242254336/2796624893460480/STEM/25c391b3-1920-4e56-8e4e-aaa212b323f2.png?resizew=526)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386e0b896cffcc48dd4a4042ae5cbad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbfd0c7caacb8f926dbc857f913a6dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4b3472f3a7b4083d5c7538c5d19ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e340674361f3742dd118ccc82d23c741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,△ABC的顶点坐标分别为A(4,3),B(3,1),C(1,2),△A1B1C1与△ABC关于原点对称.
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361811330334720/2362581608448000/STEM/b2c240c3e25c4542b8b3afe1c3c40926.png?resizew=223)
(1)写出A1,B1,C1的坐标;
(2)在所给的平面直角坐标系中画出△A1B1C1;
(3)若点A(4,3)与点M(a﹣2,b﹣4)关于原点对称,求关于x的方程
的解.
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361811330334720/2362581608448000/STEM/b2c240c3e25c4542b8b3afe1c3c40926.png?resizew=223)
(1)写出A1,B1,C1的坐标;
(2)在所给的平面直角坐标系中画出△A1B1C1;
(3)若点A(4,3)与点M(a﹣2,b﹣4)关于原点对称,求关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0258d5d9ebd4cbd468acc8dd9c4c878.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知Rt△EBC中,∠B=90°,A为BE边上一点,以边AC上的点O为圆心、OA为半径的圆O与EC相切,D为切点,AD∥BC.
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457613710557184/2458300964864000/STEM/b35f7c39314045a883fb431756810fd9.png?resizew=192)
(1)求证:∠E=∠ACB.
(2)若AD=1,
,求BC的长.
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457613710557184/2458300964864000/STEM/b35f7c39314045a883fb431756810fd9.png?resizew=192)
(1)求证:∠E=∠ACB.
(2)若AD=1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879d3adc3a7c49b238a60ebfa4cd89a7.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,点
、
分别在
、
上,且
,
与四边形
的面积的比为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce735bef8c7fc6a1ddcebd449e38f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5881f1ce9b4172ca346032d0fd1e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/61e0951d-bec0-4bde-b751-a5ddbaabb10f.png?resizew=118)
您最近一年使用:0次