题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204345-41256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204345-78266.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204346-30809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204347-31481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204347-43208.png)
点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204345-41256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204345-78266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204347-95104.png)
核心考点
举一反三
A.![]() | B.![]() | C.![]() | D.![]() |
A.10cm B.5cm C.10
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204331-75080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204331-75080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204331-88363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204324-28880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204324-50972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204325-94357.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204325-49479.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204325-44193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204325-70626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204317-80584.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204311-39622.gif)
1)求证:AO
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204311-85387.gif)
2)求异面直线AB与CD所成角的余弦值;
3)求点E到平面ACD的距离。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022204311-43822.jpg)
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