问题:如图,在
中,点E,点F在对角线AC上(不与点A,点C重合),连接BE,DF.若______,求证:
.在①
,②
,③
这三个条件中选择其中一个,补充在上面问题中,并完成问题的解答.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fb624bcae7cf99ce00e0712f0fd892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec65ec09ca29376007ed3890e0091d2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/fc74567b-7518-4a1e-8aff-686b544fc860.png?resizew=251)
更新时间:2022-05-16 10:48:29
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适中
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【推荐1】如图,
是等边三角形,点
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解答题-证明题
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适中
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【推荐2】如图,四边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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(要求:保留作图痕迹,不写作法,标明字母)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,
是
的中点,
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![](https://img.xkw.com/dksih/QBM/2019/7/9/2243022133944320/2243167445786624/STEM/2ecd5c41f82e40fe926af525e92d6c84.png?resizew=236)
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;
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在平行四边形
中,过点A作
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