1 . 如图,设四棱锥
的底面为菱形,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/25/1573039501918208/1573039508103168/STEM/c62561cb-bdb6-4b24-8b79-7ae5233c0e8a.png?resizew=225)
(1)证明:平面
平面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc36e0463056bc2dc03e3b79e00f17e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/25/1573039501918208/1573039508103168/STEM/c62561cb-bdb6-4b24-8b79-7ae5233c0e8a.png?resizew=225)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde1e200d1dd5ddc433c876c9d2f688c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
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2016-12-04更新
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4卷引用:辽宁省大连市庄河市高级中学2021-2022学年高二上学期10月月考数学试题