如图,四边形
中,
,
是
上两点,
,
.若
,求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5f31365e525d5fe2c1be3eaa2f869c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2547f1d59a0e902831c6c4f9e48e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f3175a979c2f908d6c5665e14894b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2023-06-12 20:51:40
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在等边△ABC中,AB=15cm,DC=7cm.点M以2cm/秒的速度在线段CB上由点C向点B运动,点N在线段BA上由B点向A点运动.设运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712870559744/2859463157219328/STEM/a1f2b2a2-6409-493b-9f08-a361993cb6d4.png)
(1)如果它们同时出发,点N的运动速度与点M的运动速度相等.
①经过多少秒,△BMN和△CDM全等?
②经过多少秒,△BMN是一个直角三角形?
(2)设点N的运动速度为xcm/秒,点N,点M同时出发,若△BMN和△CDM全等?求x,t的值.
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712870559744/2859463157219328/STEM/a1f2b2a2-6409-493b-9f08-a361993cb6d4.png)
(1)如果它们同时出发,点N的运动速度与点M的运动速度相等.
①经过多少秒,△BMN和△CDM全等?
②经过多少秒,△BMN是一个直角三角形?
(2)设点N的运动速度为xcm/秒,点N,点M同时出发,若△BMN和△CDM全等?求x,t的值.
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在四边形
中,
是对角线,
是等边三角形,线段CD绕点
顺时针旋转
得到线段
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/4abc54d2-dbb6-4b9a-910b-5f6f7ea602fb.png?resizew=151)
(1)求证:
;
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/4abc54d2-dbb6-4b9a-910b-5f6f7ea602fb.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2c34a83631c3127ca5896e00cda297.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6662097cf94dc37facdaba44b49966d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c85409e4c685f7dbadae2de3cf9a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,点
是边
的中点,延长
,
交于点
,连接
,
.
;
(2)若
,求证:四边形
为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c244edbf77fbb8e9c017515e370c5c8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7e48723871f06a6aeae31a2a1ff79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61510c34c5795d7261569b4d09098271.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】正方形ABCD中,E为AB边上的任意一点,DFDE交BC边的延长线于点F,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/85d92d2d-38eb-48fb-a7b4-a7e4859d4b17.png?resizew=374)
(1)如图1,求证:DEDF;
(2)如图2,若直线PQDE分别交AD、BC边于P、Q,求证:EQPD
PQ
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/85d92d2d-38eb-48fb-a7b4-a7e4859d4b17.png?resizew=374)
(1)如图1,求证:DEDF;
(2)如图2,若直线PQDE分别交AD、BC边于P、Q,求证:EQPD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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