题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130335-64999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130336-93059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130336-44924.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130336-90258.png)
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130336-42745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130336-99450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130337-83106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130337-14600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130337-78394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130337-45726.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130337-10967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-60467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-94945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-19984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-19839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-63577.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130338-64149.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130302-91970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130303-17350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130303-93939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130303-22262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130304-65503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130304-72839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130304-79304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130304-84228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130304-49555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130305-68205.png)
(1)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130302-91970.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130305-32709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130258-38453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130258-22487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130258-38714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130258-93439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130252-11046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130253-67677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130253-91267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-80805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-71349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-83285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-37512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130244-61531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-71349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130244-39574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130244-36891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130245-82558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130245-13081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130245-61278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130245-49308.jpg)
(Ⅰ)求四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130243-80805.png)
(Ⅱ)证明:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130246-82724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130246-89354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130239-26321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021130240-80977.png)
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