已知:如图,E是边长为2的正方形ABCD对角线BD上的一点,EF⊥BD交DC于点F,且DE=CF,求线段BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/092d9924-74d2-46ca-9df8-ea1d16df3087.png?resizew=147)
更新时间:2022-08-13 06:50:57
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相似题推荐
解答题-证明题
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【推荐1】在
中,
,
,过点C作直线
,
于点M,
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/ec36c510-9e17-4e4a-9b7c-b324eaf0bfc3.png?resizew=326)
(1)若
在
外(如图1),求证:
;
(2)若
与线段
相交(如图2),且
,
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8178a430ab04499222bae632c257f49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f721340387f17c4331a5f07a97f7025a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85c6b63bef0f632fee2e7e438a4b5cc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/ec36c510-9e17-4e4a-9b7c-b324eaf0bfc3.png?resizew=326)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ebc3f4a99aed54c21982621693dbee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081d4b3b14f2be4f5afa1fff9ae9a669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28bbf0c3849c6e6710c6ce6d80071b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
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【推荐2】如图,AE是
的角平分线,AD⊥BC于点D,若∠BAC=128°,∠C=36°,求∠DAE的度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/30384c32-eb8f-495a-b44e-98e1c7bc0663.png?resizew=173)
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解答题-作图题
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【推荐1】如图,已知,求作:
(1)尺规作图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)尺规作图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(3)用三角板过点E画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb023313112cd8a6068d013fdcc9a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82921e42bc0dd17888224d9a40ca9eea.png)
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【推荐2】如图1,在平面直角坐标系中,已知点A,B的坐标分别为(0,3),(3,0)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/51c555be-130a-4e65-ab2f-ca97308e5f9b.png?resizew=517)
(1)求直线AB的解析式;
(2)如图2,点C是点B关于y轴的对称点,点D是AB的中点,点P为y轴上自原点向正半轴方向运动的一动点,运动速度为2个单位长度/s,设点P运动的时间为ts,点Q为射线BA上一点,当t=5时,
,求点Q的坐标;
(3)如图3,在(2)的条件下,当△PDC为等腰直角三角形时,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/51c555be-130a-4e65-ab2f-ca97308e5f9b.png?resizew=517)
(1)求直线AB的解析式;
(2)如图2,点C是点B关于y轴的对称点,点D是AB的中点,点P为y轴上自原点向正半轴方向运动的一动点,运动速度为2个单位长度/s,设点P运动的时间为ts,点Q为射线BA上一点,当t=5时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804aaa77271386f2683d7198a35c24ba.png)
(3)如图3,在(2)的条件下,当△PDC为等腰直角三角形时,求t的值.
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【推荐1】已知:如图,在△ABC中,BE⊥AC,CD⊥AB,BE=CD.求证:AB=AC.
![](https://img.xkw.com/dksih/QBM/2019/1/26/2127282505703424/2129964607160320/STEM/dda8807adadf4ee5b437f00a1a4880e5.png?resizew=136)
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【推荐2】在等腰直角三角形纸片
中,点
是斜边
的中点,
点
为
上一点,将纸片沿
折叠,点
的对应点为点
.
如图①,连接
则
的长为 ;
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500272789864448/2501523919544320/STEM/20f9330a-872c-4386-979e-1001487561b5.png?resizew=162)
如图②,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500272789864448/2501523919544320/STEM/419b405e-ba33-4d11-ad0e-467ff09cbd50.png?resizew=179)
①求证:四边形
为菱形;
②连接
则
的形状为 ;
如图③,则
的周长为 ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2c5289a900cabf662913514a55efc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a1cf657792edb2da8c7c896d7320c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500272789864448/2501523919544320/STEM/20f9330a-872c-4386-979e-1001487561b5.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3a71b55603e2616756104a06ba6ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a256dfd83baf477d753043a4278f6251.png)
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500272789864448/2501523919544320/STEM/419b405e-ba33-4d11-ad0e-467ff09cbd50.png?resizew=179)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b058da6d8df32659e72779ea125babbf.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45100ddaf7760568a4677eefccf65519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4ab57faf3e0dddc8ebc9e89537a18a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7807f6a0d316671ed34c23e32fc7408.png)
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500272789864448/2501523919544320/STEM/8074b45a-4cfb-4b1f-933c-fddf9ec70305.png?resizew=195)
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【推荐1】在菱形
中,
,
,左右作平行移动的正方形
的两个顶点
、
始终在边
上.当点
到边
中点时,点
恰好在边
上.
(1)如图1,求正方形
的边长;
(2)假设点
与点
的距离为
,在正方形
作平行移动的过程中,正方形
与菱形
重叠部分的面积为
,求
与
的函数解析式,并写出它的定义域;
(3)连接
、
,当
是等腰三角形时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/b5f9ad82-18dc-4c5a-8d32-4345ee71af87.png?resizew=397)
(1)如图1,求正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)假设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f5a2ed40bffc15b379b4dcc68d379c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图,已知正方形
,
,点
在边
上,射线
交
于点
,交射线
于点
,过点
作
,交
于点
.
.
(2)判断
的形状,并说明理由.
(3)作
的中点
,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b40dedcb08f09bf7ea1c8207b6e44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f99d22ebe4f2b2a08791de45ef5ec9a.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/568173802070b53ead410b8c5cef8ba3.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d58be52ad2dd354a77b8dfe1699872c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
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【推荐3】问题背景:在解决“半角模型”问题时,旋转是一种常用方法.如图①,在四边形ABCD中,
,
,
,点E,F分别是BC,CD上的点,且
,连接EF,探究线段BE,EF,DF之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872437413593088/2922775210033152/STEM/0a37e15f-9fd2-42de-a024-86cd194e0b39.png?resizew=408)
(1)探究发现:小明同学的方法是将
绕点A逆时针旋转120°至
的位置,使得AB与AD重合,然后证明
,从而得出结论:____________;
(2)拓展延伸:如图②,在正方形ABCD中,E、F分别在边BC、CD上,且
,连接EF,(1)中的结论是否仍然成立?若成立,请写出证明过程,若不成立,请说明理由.
(3)尝试应用:在(2)的条件下,若
,
,求正方形ABCD的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eb847a1722ed6e10e23c59d53fe7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872437413593088/2922775210033152/STEM/0a37e15f-9fd2-42de-a024-86cd194e0b39.png?resizew=408)
(1)探究发现:小明同学的方法是将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
(2)拓展延伸:如图②,在正方形ABCD中,E、F分别在边BC、CD上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
(3)尝试应用:在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.png)
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