题目
题型:不详难度:来源:
如图,在直三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084117-19053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084117-95723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084117-81373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084118-18455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084118-82236.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084118-63813.jpg)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084118-42802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-55302.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-50280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-88403.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-50727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-30809.gif)
与
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-69015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-99121.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-31770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-19335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084118-18455.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-50058.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-26094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-26217.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-71278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-38775.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-18506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-38775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084122-64464.gif)
|
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084122-19851.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084122-77747.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084122-39904.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084123-17742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084123-56795.gif)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084123-39509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084123-12448.gif)
|
|
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084123-41429.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084124-48563.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084124-98172.gif)
|
|
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084124-22802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084124-57019.jpg)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084124-80409.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084125-76615.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084125-89822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084125-35711.gif)
(2)(方法一)取
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084125-26896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084126-78225.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084126-76439.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084126-47705.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084126-47241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084126-75560.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084127-69476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084127-56576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084119-30809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084120-69015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084127-25619.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084127-85571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084128-72793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084128-86897.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084128-24347.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084128-81300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084128-51362.gif)
(方法二)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084129-34199.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084129-59047.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084121-26094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084129-81267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084129-41941.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084129-15842.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084130-20777.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084104-30833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084104-21355.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084104-30833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084104-15612.gif)
|
在如图
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084039-36055.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084039-91015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084039-44982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084039-26870.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084040-99962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084040-58045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084040-96459.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084040-25496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084040-20044.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084041-87988.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084041-66508.gif)
(Ⅰ)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084041-56008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084041-58288.gif)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084042-21693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084042-95647.gif)
图7
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-69513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-55546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-84306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-44294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-69513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-55546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-84306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084035-85733.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084036-57694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084036-21524.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084025-26015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084025-63457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084025-60395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084025-87907.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084020-70062.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084021-53600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022084021-79556.gif)
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