1 . 在如图所示的几何体中,四边形
是正方形,
平面
,
分别为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2017/3/3/1635734485401600/1635910460702720/STEM/68bc0ad244c64227b335d6a4297567d1.png?resizew=196)
(1)求证:平面
平面
;
(2)求证:平面
平面
;
(3)求三棱锥
与四棱锥
的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821f8dbb1df39a1aa3070af00c8fb044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308f5a2ad097843999e6d9e68d6cf022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ae89f94a73f32a4ed3b138bea550ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e096b55732175ddd58f851903b87dc65.png)
![](https://img.xkw.com/dksih/QBM/2017/3/3/1635734485401600/1635910460702720/STEM/68bc0ad244c64227b335d6a4297567d1.png?resizew=196)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827af56c71c49a224f75f59e4ffbf71a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea538365f9a15deeea31f87a5d745b4e.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82799f3333a3a8c9659935fb9902726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda09fb28b8f1e165715cca61d64f9c1.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff73b7f5d154b2f7a1962c26841624fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
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2017-03-03更新
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3215次组卷
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2卷引用:2016-2017学年安徽省六安市第一中学高一上学期周末作业(十三)数学试卷