题型:解答题-证明题
难度:0.85
引用次数:92
题号:20074130
如图,BD平分
,
,垂足为点D,
.求证:
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
更新时间:2023-09-07 17:06:22
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【推荐1】如图,∠AOC=140°,OD平分∠AOC,OE平分∠BOC.
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573982121852928/1573982128390144/STEM/965b1da9b79e43ada6d9e724f144b8f8.png?resizew=178)
(1)求∠BOE的度数.
(2)求∠DOE的度数.
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573982121852928/1573982128390144/STEM/965b1da9b79e43ada6d9e724f144b8f8.png?resizew=178)
(1)求∠BOE的度数.
(2)求∠DOE的度数.
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解答题-问答题
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【推荐1】如图,将一副三角板中的两块直角三角尺的直角顶点O按如图方式叠放在一起.
(1)判断大小关系:∠AOD______∠BOC(填>、=、<等)
(2)若 ∠BOD=35°,则∠AOC= ;若∠AOC=135°,则∠BOD= ;
(3)猜想 ∠AOC与∠BOD的数量关系,并说明理由.
(1)判断大小关系:∠AOD______∠BOC(填>、=、<等)
(2)若 ∠BOD=35°,则∠AOC= ;若∠AOC=135°,则∠BOD= ;
(3)猜想 ∠AOC与∠BOD的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124775963156480/2127195881750528/STEM/6b3c5240dc5f428db0b1dddf9f2536c6.png?resizew=141)
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解答题-证明题
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【推荐2】如图,在
中,
,垂足为
,
,垂足为
,
,BE=AC;求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/c6d7a140-de98-41a4-a44c-fb3860f3d74a.png?resizew=210)
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解答题-证明题
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【推荐1】如图,已知
,作
的平分线OC,将直角尺DEMN如图所示摆放,使EM边与OB边重合,顶点D落在OA边上,DN边与OC交于点P.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2899834210287616/2973483522695168/STEM/3866f735-f4f9-40f8-8444-a63a89e867c4.png?resizew=157)
(1)猜想
是 三角形;
(2)请将猜想到的结论进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ab141e7a809aa0f7f46c9df9de2b0e.png)
(2)请将猜想到的结论进行证明.
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【推荐2】已知:如图,AB⊥BE于点B,DE⊥BE于点E,F、C在BE上,AC、DF相交于点G,且AB=DE,BF=CE.
求证: GF=GC.
求证: GF=GC.
![](https://img.xkw.com/dksih/QBM/2012/2/24/1573345706147840/null/STEM/5ca0beca39d44c8aa23304c1797f12a7.png?resizew=194)
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