如图, 四边形
是平行四边形,对角线
、
交于点
,
是
的中点,以下说法错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/13d53720-93d0-431d-9838-79e6c9e31cd8.png?resizew=198)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/13d53720-93d0-431d-9838-79e6c9e31cd8.png?resizew=198)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-03-12 21:49:35
|
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【推荐1】如图,在
中,
,
为锐角,
是对角线
的中点.某数学学习小组要在
上找两点
,使四边形
为平行四边形,现总结出如下甲、乙、丙三种方案:甲:分别取
的中点
,乙:作
分别平分
,丙:分别作
垂直
于点
.
其中所有正确的方案是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9199a3de404cb13ae7710f73db5c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08be58683fe1c6eb336c79f698dc3dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851ab1aa713a2d1c21e886c8acd3f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7133a26c730e7c7e63d490e0c25067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851ab1aa713a2d1c21e886c8acd3f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/27/e38bfe38-8d3f-4a24-b66c-58a9feec700c.png?resizew=406)
其中所有正确的方案是( )
A.仅甲 | B.仅甲、乙 | C.仅乙、丙 | D.甲、乙、丙 |
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【推荐2】如图,四边形ABCD中,AD∥BC,∠ABC+∠DCB=90°,且BC=2AD,以AB、BC、DC为边向外作正方形,其面积分别为S1、S2、S3,若S1=3,S3=9,则S2的值为( )
![](https://img.xkw.com/dksih/QBM/2017/12/6/1832593752383488/1836244467859456/STEM/9a0b1bf8-ea08-4ad9-b195-a33c8a85647b.png)
![](https://img.xkw.com/dksih/QBM/2017/12/6/1832593752383488/1836244467859456/STEM/9a0b1bf8-ea08-4ad9-b195-a33c8a85647b.png)
A.12 | B.18 | C.24 | D.48 |
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【推荐1】如图,在
中,点
是
的中点,点
在
的内部,
,
,若
,
,则
的长为( )
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
A.1 | B.![]() | C.1.5 | D.2 |
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【推荐2】如图,在△ABC中,D为AB的中点,E为AC的中点,F是DE上一点,且AF⊥BF,若AB=10,BC=16,则线段EF的长为( )
![](https://img.xkw.com/dksih/QBM/2016/12/22/1633714416918528/1633714417090560/STEM/e8d27cb197a64830a9da39ae667d43d1.png)
![](https://img.xkw.com/dksih/QBM/2016/12/22/1633714416918528/1633714417090560/STEM/e8d27cb197a64830a9da39ae667d43d1.png)
A.2 | B.3 | C.4 | D.5 |
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