题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091136-33288.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091136-94719.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091137-82113.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091137-41258.gif)
(2) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091137-68542.gif)
(3) 当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091137-65081.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091137-40167.gif)
答案
(1)证明略
(2)证明略
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091138-94318.gif)
解析
(1) 在平面ABC中,作
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091138-72902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091138-70877.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091138-24025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-94785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-71919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-79826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-67425.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-78380.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-94982.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-96908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091141-51159.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091141-35567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091141-21849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091141-88063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-96908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-83867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-62872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091140-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-72260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091142-57681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091139-81289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091143-41740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091143-52055.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091143-61769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091143-65028.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091144-46775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091138-94318.gif)
核心考点
试题【已知正方形ABCD所在平面与正方形ABEF所在平面互相垂直,M为AC上一点,N为BF 上一点,且有,设(1) 求证:;(2) 求证: ;(3) 当为何值时,取最】;主要考察你对直接证明与间接证明等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091129-30935.png)
可以推测
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091129-23894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091129-52004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091129-52004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091116-32897.gif)
A.29 | B.254 | C.602 | D.2004 |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091110-22274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091110-59279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091103-87500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091104-69236.gif)
(本小题10分)
证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106091058-94746.gif)
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