名校
解题方法
1 . 已知正方体
的棱长为1,P为AC的中点.
内找一点
,使
//平面
,并证明;
(2)求三棱锥
的体积和表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1b479d85c1c4237b51084e68544dab.png)
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