在三棱锥
中,底面为正三角形,各侧棱长相等,点
分别是棱
的中点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097eff47dbfcccb77aaacc0ec4cdbf2c.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355b74ba3dff8a70c29cfd51c00df29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f7e08309c85f05c0a1bb58c369c242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097eff47dbfcccb77aaacc0ec4cdbf2c.png)
![](https://img.xkw.com/dksih/QBM/2018/2/9/1878597929836544/1879990287073280/STEM/f575dc3bddb742f689171ac4bfe9e43b.png?resizew=136)
更新时间:2018-02-11 13:12:56
|
【知识点】 证明线面垂直
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