题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043817-10830.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043817-32625.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043818-17199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043818-31432.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043818-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043818-77903.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043819-25427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043819-80504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043819-56985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043819-23667.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-82991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-17794.gif)
(2) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-47315.gif)
(3) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-45207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-51725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-49572.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-28120.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-86334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043822-53553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043822-53569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043818-77903.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043819-56985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-86334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043822-25860.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043822-66071.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-17794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043823-39668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-17794.gif)
(2)由(1)中证明易知
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043823-85381.gif)
(3)取
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043823-86101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043823-32075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-75533.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-21238.gif)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-21238.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-56114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-58778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-48595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-56114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043824-21238.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-56945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-81404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-56945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-55794.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-78377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-51725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043826-47808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-51725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043825-56945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043820-45207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043821-51725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043826-33697.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043806-24063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043806-28369.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043806-67975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043806-89690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043806-53528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043807-11378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043807-64794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043807-12891.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043807-86448.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043807-19256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043808-56068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043808-28892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043757-53291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043757-72362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043757-97168.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043758-14898.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043749-47635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043749-69929.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043750-83460.gif)
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043741-46161.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043741-48882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043741-81354.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043741-58750.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043742-84536.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043742-90126.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043742-43497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043742-51487.gif)
求证:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043742-43537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-11685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-26109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-11685.gif)
(2)平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-11685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-69000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043743-31889.gif)
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043732-84022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043732-68207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043733-59698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043733-19064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043733-26698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043733-64713.gif)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043734-98275.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043734-66336.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106043734-46677.jpg)
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