如图1,在
中,
,
,点D是
的中点,
是
内的一条射线,点E,F都是
上的点,已知
且
,连接
,
.
;
(2)设
与
交于点O,求证:
;
(3)如图2,当射线
在
外部时,其他条件不变,探索
,
和
之间的数量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78561e744c5f93b6a07c521cd4e48624.png)
(3)如图2,当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2024-04-24 08:49:07
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【推荐1】如图,E、F、M、N分别是正方形
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【推荐2】如图,菱形
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解答题-问答题
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适中
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【推荐1】如图,△ABC 中,BD、CE分别是AC、AB上的高,BD与CE交于点O.BD=CE
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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,在△ABC中,AB=AC,D为AC延长线上一点,且DE⊥BC交AB于点F.
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解答题-证明题
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适中
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【推荐1】如图,在△ABC中,点D在边AB上,点F、E在边AC上,且DF∥BE,
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【推荐2】如图,在△
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解答题-证明题
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【推荐1】在平行四边形ABCD中,对角线AC与BD相交于点O,∠ABD=∠ACB.
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(1)求证:△ABO∽△ACB;
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适中
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【推荐2】如图,梯形ABCD中,AD∥BC,AB⊥BC,∠BAC=60°,∠ADC=135°,BC=12
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