空间中任意四个点
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3442261938ef9fb4bc23363c3e41e40a.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3442261938ef9fb4bc23363c3e41e40a.png)
更新时间:2022-10-20 11:37:07
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