(1) 已知:如图1,等腰直角三角形ABC中,∠B=90°,AD是∠BAC的外角平分线,交CB边的延长线于点D.
![](https://img.xkw.com/dksih/QBM/2018/1/13/1859295886065664/1865953038278656/STEM/caa9ef4f08b844edac45b4e27fd243d6.png?resizew=222)
求证:BD=AB+AC.
(2)对于任意三角形ABC,∠ABC=2∠C,AD是∠BAC的外角平分线,交CB边的延长线于点D,如图2,请你写出线段AC、AB、BD之间的数量关系并加以证明.
![](https://img.xkw.com/dksih/QBM/2018/1/13/1859295886065664/1865953038278656/STEM/caa9ef4f08b844edac45b4e27fd243d6.png?resizew=222)
求证:BD=AB+AC.
(2)对于任意三角形ABC,∠ABC=2∠C,AD是∠BAC的外角平分线,交CB边的延长线于点D,如图2,请你写出线段AC、AB、BD之间的数量关系并加以证明.
![](https://img.xkw.com/dksih/QBM/2018/1/13/1859295886065664/1865953038278656/STEM/c24394ba9b1c496b86d570287c69d8a4.png?resizew=326)
更新时间:2017-12-23 23:28:11
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【知识点】 全等三角形综合问题
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解答题-证明题
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适中
(0.65)
【推荐1】如图,已知点
在同一直线上,
;
![](https://img.xkw.com/dksih/QBM/2020/2/23/2405075510886400/2405298493767680/STEM/d1b3d2ba7fcd4ef08ca752637dc53187.png?resizew=166)
求证:(1)
;
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求证:(1)
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(2)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在
中,
,AD平分∠BAC,交BC于点D,DE⊥AB于E,点F在AC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/350f37ef-443d-4173-b71e-d9da9417dec4.png?resizew=143)
(1)求证:
;
(2)若
,
,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47256452f509ebc7ff090ca5cfc88142.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/350f37ef-443d-4173-b71e-d9da9417dec4.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
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