题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134628-31968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134628-11229.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134629-26098.png)
所以∠AOC=
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134629-77635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134629-77635.png)
故选B
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134605-54872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134605-62381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134605-50887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134605-62381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134605-35392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134606-10222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134606-11534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134606-10146.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134607-83570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134607-67460.png)
(2)若四面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134607-64648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134607-20430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134608-10458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134551-26813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134551-54273.png)
(1)若几何体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134551-26813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134551-57000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-28459.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-30219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-83719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-92773.png)
(3)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-28459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134553-14117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134553-36581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134552-28459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134553-48753.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134553-96445.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-17565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-53057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-47822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-66506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-78792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-47143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-60172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-94569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-36359.jpg)
(1)求四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134535-17565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-31133.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-56642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-63601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134536-94347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134537-44914.png)
(3)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021134537-23459.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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