题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-19973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-15408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-19973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-99744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-80555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-32302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-92079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-83985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-28411.png)
(Ⅰ)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-43970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-77803.png)
(Ⅱ)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-76499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-21704.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-82555.png)
解析
试题分析:(Ⅰ)要证面面垂直则先证线面垂直,此题由已知条件先证明
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-56999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131027-40604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131027-16902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131027-36414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131027-37072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131028-20044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131026-76499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131028-84579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131028-15974.png)
试题解析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131028-13745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131028-52300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131029-13546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-19973.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131029-42484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131025-19973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131029-87594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131029-62245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131030-64651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131030-37484.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131030-56686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131030-89222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131030-47458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131031-62095.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131031-88967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131031-28013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131031-84397.png)
依题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131032-81046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131032-11998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131032-12809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131032-25016.png)
核心考点
举一反三
A.2![]() | B.4![]() | C.8![]() | D.16![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131016-53459.png)
A.![]() | B.44 | C.20![]() | D.46 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131009-23780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131009-15923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021131009-51784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130958-77731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130958-29325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130959-62554.png)
(1)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130959-74411.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130959-87257.png)
(3)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130959-33381.png)
A.S1>S2>S3, V1>V2>V3 | B.S1>S2>S3, V1=V2=V3 |
C.S1<S2<S3, V1<V2<V3 | D.S1<S2<S3, V1=V2=V3 |
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