在梯形
中,已知
,
,
,若
,则
=_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7df9ff499a858520513ee1ca3d83f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cecf3c457d7fde838703ee70c62479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
更新时间:2020-03-16 22:02:24
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【推荐1】已知正三角形
的边长为
,
,
为
的三等分点,
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________ .
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【推荐2】边长为4的正三角形
,
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【推荐1】在平面直角坐标系中,已知
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【推荐2】在矩形ABCD中,AB=4,AD=3,M,N分别是AB,AD上的动点,且满足
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【推荐3】已知矩形
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