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1 . 如图,边长为2的正方形ABCD中,E、F分别是AB、BC边的中点,将
,
分别沿DE,DF折起,使得A,C两点重合于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b19bb5cc-5fed-4f51-843a-df356184c248.png?resizew=290)
(1) 求证:
;
(2) 求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b19bb5cc-5fed-4f51-843a-df356184c248.png?resizew=290)
(1) 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f980eb0ccb87781999934b76bd15e8c9.png)
(2) 求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296fb1e314813e5309e93e37f2569bea.png)
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2019-03-27更新
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826次组卷
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4卷引用:四川省南充市2015-2016学年高一年下学期学业水平评估考试数学