题目
题型:不详难度:来源:
且a⊥α,b⊥β,则下列命题中为假命题的是
A.若a∥b,则α∥β |
B.若α⊥β,则a⊥b |
C.若a,b相交,则α,β相交 |
D.若α,β相交,则a,b相交 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072257-19600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072257-71366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-54949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-30369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-55765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-36570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072259-60036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-36570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-54949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072259-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072259-60036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072259-76674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-75678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-54949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-39904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072259-28843.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072258-30369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-20050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-88274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-36228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072301-22185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-20050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072301-22185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072300-36228.png)
核心考点
试题【已知a、b为两条不同的直线,α、β为两个不同的平面,且a⊥α,b⊥β,则下列命题中为假命题的是A.若a∥b,则α∥βB.若α⊥β,则a⊥bC.若a,b相交,则α】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072252-56105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072252-67428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-55989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-91494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-55989.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-92050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-99099.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-92050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-52041.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-92050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072254-79233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-99099.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072253-92050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072254-16827.png)
其中能成为增加条件的是_____________.(把你认为正确的条件的序号都填上)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072254-22068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-79505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-30626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-52125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-76451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-27734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-40296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-76652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-13261.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-67780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-62260.png)
(Ⅱ)求圆锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072242-79505.png)
(Ⅲ)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-67780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072243-29035.png)
(Ⅰ)求证:AC⊥平面SBD;
(Ⅱ)若E为BC中点,点P在侧面△SCD内及其边界上运动,并保持PE⊥AC,试指出动点P的轨迹,并证明你的结论.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072236-11028.png)
A.30° | B.45° | C.60° | D.90° |
(I)求证:平面ECD⊥平面BCD
(II)求二面角D-EC-B的正切值
(III)求三棱锥A-ECD的体积
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022072218-58253.png)
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