题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065748-72966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065748-59146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065748-62028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065749-78007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065749-81841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065749-78380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065749-58495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065750-89460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065748-59146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065750-16666.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065751-77752.jpg)
连接
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065751-90862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-55695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-34289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-39670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-32783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-68854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065753-64290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065753-81383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065753-87801.png)
连接
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065753-99006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-55695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065754-29406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065754-43154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065754-79526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065754-59706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065754-73475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065755-59320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065755-23200.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065752-55695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065755-46441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065755-18466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065755-75229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065756-24449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065756-90308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065756-53610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065756-72944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065757-79768.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065736-46416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-54822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-43240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-28169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-28056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-58430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065737-18754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065738-73833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065738-18810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065738-23793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065738-35656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065738-98401.png)
(Ⅰ) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065739-44208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065739-44198.png)
(Ⅱ) 求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065739-14073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065725-57377.png)
(1)求证:EF
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065725-57377.png)
(2)求DB与平面DEF所成角的正弦值;
(3)在平面PAD内求一点G,使GF
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065725-57377.png)
证明你的结论。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065725-12895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065712-94537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065712-22746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065713-87378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065713-87048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065712-94537.png)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() |
D.平面![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065715-12475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065701-33194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065702-42645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065702-79352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065702-98534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065702-15041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065703-32695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065703-26352.png)
(Ⅰ)在直角坐标平面内,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065651-12577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065651-60807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065651-51477.png)
(Ⅱ)在平面内,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-55923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-13072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-80351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-79011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-61249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-30108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-51705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065652-18067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022065653-89304.png)
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