如图
,在平行四边形
中,点
、
分别为
,
的中点,点
,
在对角线
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ed105742-b8f8-4c0d-a43f-cc8eb625f83a.png?resizew=344)
(1)求证:四边形
是平行四边形.
(2)如图
,连
交
于点
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a15346cf93dc605b05f16bfa4eaa2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ed105742-b8f8-4c0d-a43f-cc8eb625f83a.png?resizew=344)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5406e7922357e0396a651e0cda56de93.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6da873e0bff7072b3c530047e79e2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
更新时间:2022-11-19 16:09:33
|
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解答题-问答题
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适中
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名校
【推荐1】问题发现:如图1,在△OAB和△OCD中,OA=OB,OC=OD,∠AOB=∠COD=40°,连接AC,BD交于点M,
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(1)填空:
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![](https://img.xkw.com/dksih/QBM/2020/1/15/2377708366856192/2378407677919233/STEM/732dc448-d0ac-46ac-b221-4272c918ee65.png?resizew=439)
(1)填空:
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(2)类比探究,如图2,在△OAB和△OCD中,∠AOB=∠COD=90°,∠OAB=∠OCD=30°,连接AC交BD的延长线于点M,请判断
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【推荐2】如图,△ABC中,AD⊥BC于D,若BD=AD,FD=CD.
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【推荐1】在四边形
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![](https://img.xkw.com/dksih/QBM/2020/11/5/2586490904944640/2589050932756480/STEM/fa3a25b8047f4897ab07b056367cf638.png?resizew=211)
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平分
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbffff80147184400d5367c7067d154.png)
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【推荐2】分别以Rt△ABC的直角边AC及斜边AB向外作等边△ACD、等边△ABE.已知∠ACB=90°、∠BAC=30°,EF⊥AB,垂足为F,连接DF、CF.
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【推荐1】如图,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cdbe3384e3b1058692c5f2921abd93.png)
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