在棱长为
的正四面体
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9947bc4995a0e5489e7531209939775a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c321ca62e0f54191315e0dbc6832478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9947bc4995a0e5489e7531209939775a.png)
更新时间:2023-11-17 15:35:40
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