题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-30077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-30077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-47016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-30077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-67794.jpg)
(1)求证:P、C、D、Q四点共面;
(2)求证:QD⊥AB.
答案
解析
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-46562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-46248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-34084.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-21797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-77377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-73077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-50264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031552-72974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031552-72809.png)
证明:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-46562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031550-46248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-34084.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-21797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-77377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-73077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031551-50264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031552-72974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031552-72809.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031552-32021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031553-21685.png)
核心考点
试题【(本小题满分12分) 如图,已知平面∩平面=AB,PQ⊥于Q,PC⊥于C,CD⊥于D.(1)求证:P、C、D、Q四点共面;(2)求证:QD⊥AB.】;主要考察你对向量与空间位置关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031540-78386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031540-51891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031541-93694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031541-16235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031541-10248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031541-35675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031542-93283.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031542-83894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031542-87429.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031542-79541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031543-52361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031543-66669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031542-87429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031543-79139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-36685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-76554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-76547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-65323.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-98844.png)
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031534-10526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031533-36685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031534-49587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031534-46485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031534-69333.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031522-57395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031522-22579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-80757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-65290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-62990.png)
给出下列四个命题:
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-43276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031524-20650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031524-76062.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031524-41937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031524-23680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031525-58579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031525-32230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031525-55804.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031525-39408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031526-12255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031526-57456.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-65290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031523-62990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031526-87416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031525-32230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031526-57348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031527-52468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031527-78211.png)
其中真命题的序号是( )
A.①③④ | B.①②③ | C.①③ | D.②④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031516-30839.png)
已知三棱锥PABC中,PA⊥平面ABC,AB⊥AC,PA=AC=
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031516-58649.png)
N为AB上一点,AB=4AN,M,S分别为PB,BC的中点.
(I)证明:CM⊥SN;(II)求SN与平面CMN所成角的大小.
①若a//M,b//M, 则a//b ②若a//M, b⊥M,则b⊥a ③若a
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031511-78731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106031511-78731.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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