题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034856-73999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034856-27803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034856-34496.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034858-93211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034858-35605.png)
核心考点
举一反三
(1)求证:MN⊥AB;
(2)若平面PDC与平面ABCD所成的二面角为θ,能否确定θ,使直线MN是异面直线AB与PC的公垂线?若能确定,求出
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034850-32609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034850-40777.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034826-61465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034827-54261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034827-82921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034827-80385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034828-19340.png)
(I)在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034828-33207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034828-99728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034828-66283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034828-87574.png)
(II)求平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034829-87326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034827-54261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034829-94362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034829-18509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034817-37713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034817-80708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034817-39396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034817-32542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034818-32205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034818-73341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034818-96794.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034756-48985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034757-62137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034757-57826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034757-15948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034757-36561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034758-64942.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034758-10272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034758-63625.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034758-24017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034759-34485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034759-99944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034759-31875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034759-80884.png)
四棱锥P-ABCD中,底面ABCD为直角梯形,
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034747-43682.png)
PA⊥底面ABCD,PD与底面ABCD成
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034747-86540.png)
(1)点H在AC上且EH⊥AC,求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034747-44543.png)
(2)求AE与平面PCD所成角的余弦值;
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034747-18661.png)
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