如图,AD是Rt△ABC斜边上的高,若AB=2,BC=6,求BD的长.
![](https://img.xkw.com/dksih/QBM/2020/1/17/2378842728243200/2379899998765056/STEM/db4544fb8447454b8ebf1e4370699f9b.png?resizew=164)
更新时间:2020-01-18 20:21:51
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解答题-证明题
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适中
(0.65)
【推荐1】如图,△ABC和△DEF均为正三角形,D,E分别在AB,BC上,请找出一个与△DBE相似的三角形并证明.
![](https://img.xkw.com/dksih/QBM/2012/4/5/1573362195767296/null/STEM/b8e9895d844145768818a1d451896031.png?resizew=143)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,点D,E,F分别在边
,
,
上,且
.
(1)求证:
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b44fccdada402d14b94ed57402c30d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/27c66cc9-dc08-49fa-96a5-159554c3f34c.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19092b11e09d47e226ca9dae885b257a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4268f069ee3a67924b2905367684979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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