在![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/04cb6dff1f4c4875a8fde2a6211dc569.png)
中,
、
分别是
、
上的点,且![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/c4f33a041ced467e9130445c2c57a7a3.png)
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/7a12d59291124c4694208410010889a0.png)
求证:四边形
是平行四边形.
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/04cb6dff1f4c4875a8fde2a6211dc569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/e695441d400147fc8831878546634b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/cf5c7944d04147acac4b47ef33992073.png)
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/c4f33a041ced467e9130445c2c57a7a3.png)
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/7a12d59291124c4694208410010889a0.png)
求证:四边形
![](https://img.xkw.com/dksih/QBM/2015/10/23/1573921225621504/1573921231978496/STEM/dad93edbab1e409e80200d049a70b1cf.png)
更新时间:2016-12-06 02:53:51
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【知识点】 利用平行四边形性质和判定证明解读
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=3,AC=4,BC=5,△ABD,△ACE,△BCF都是等边三角形.
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(1)证明:四边形AEFD是平行四边形;
(2)求∠DFE的度数.
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(1)证明:四边形AEFD是平行四边形;
(2)求∠DFE的度数.
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解答题-问答题
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较易
(0.85)
【推荐2】如图点O为
的对角线
的中点,过点O作任意一条直线交
,
于点E,F,连接
,
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是平行四边形吗?请说明理由.
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/5ff98eca-c9bc-4eb0-8c5a-b6abbcee8b03.png?resizew=203)
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