名校
1 . 已知三棱锥
,点M,N分别为线段AB,OC的中点,且
,
,
,用
,
,
表示
,则
等于_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a9cb32a25c2a8bb99f75633b4cd5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049131856ba841523793ee3d83099014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eca8aa7145b2327dbccba46da05bb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850304005734400/2869334767181824/STEM/1c96a712-5281-47ce-9781-9129a1375539.png?resizew=243)
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2021-12-10更新
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