题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-98146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-99548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-85747.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:求
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-85747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-98146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201954-90720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201954-90720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-99548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201953-85747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201955-26559.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201940-50829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201941-74026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201941-53210.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201932-21164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201933-94967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201927-16612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201927-25711.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201856-86541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201856-27430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201856-96902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201857-16172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201857-91537.jpg)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201857-75584.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201856-96902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201857-16172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201856-96902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201858-10729.png)
(3)线段
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201858-65239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201858-18302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201858-76465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022201843-50256.png)
(1)求证:PC⊥AC;
(2)求二面角M﹣AC﹣B的余弦值;
(3)求点B到平面MAC的距离.
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