如图,
中,
,
,点E,A分别是
,
的中点,过点C作
的平行线与
的延长线交于点D.
(1)证明:四边形
是菱形;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d91516b20966870a244db47ff4cf08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a72990e374bbb507de4c95eee2d9f67c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9f8822b052d3486b5fd48d38da189d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/4f42ce86-65ee-4d12-8cef-4ba9a0633871.png?resizew=143)
(1)证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
更新时间:2023-08-13 05:22:29
|
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解答题-证明题
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适中
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名校
【推荐1】在四边形ABCD中,AD∥BC,AD=BC,对角线AC、BD交于点O,BD平分∠ABC,延长AD至点E,使DE=BO,连接OE.
(1)求证:四边形ABCD是菱形;
(2)若AD=6,∠DAB=60°,求OE的长.
(1)求证:四边形ABCD是菱形;
(2)若AD=6,∠DAB=60°,求OE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/8494c6ac-1d4b-499c-93c8-b9e4bb40e4b7.png?resizew=220)
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解答题-问答题
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适中
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【推荐2】如图,在
和
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(1)问题提出:如图1,若
,
.
①
与
的数量关系为________;
②
的度数为________.
(2)猜想论证:如图2,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)问题提出:如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
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【推荐1】如图,直角三角形ABC中,∠ABC=90°,以边AB为直径作圆O,交AC于点E,点D是BC的中点,连接DE
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
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解答题-证明题
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【推荐2】已知:
是凸四边形,且
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、
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交
于
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于
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适中
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【推荐2】已知:如图,在△ABC,AB=AC,AD是BC边上的中线,E是AC的中点,BF⊥CA延长线于点F.求证:∠CBF=∠ADE.
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解答题-证明题
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适中
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名校
【推荐1】如图,平行四边形
的对角线
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交于点
,
为
的中点.连接
并延长至点
,使得
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,
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为平行四边形;
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为矩形.
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解答题-证明题
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适中
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【推荐2】已知矩形
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