题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054443-51026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054443-45386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054443-29319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054444-46753.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() | D.若![]() ![]() ![]() |
答案
解析
试题分析:A.若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054444-62245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054444-21737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054444-61698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054446-12673.png)
B.若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054444-46753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054445-27385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054445-58845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054447-69426.png)
C.若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054445-93185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054445-65959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054445-31265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054446-28728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054447-18393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054447-54407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054446-28728.png)
点评:典型题,涉及立体几何的平行关系、垂直关系,是高考的必考内容,难度不大,要求定理、公理要记清。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054438-64092.png)
如图,四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054422-36065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-11433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-72084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-11433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-60539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-61724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054423-62742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054424-64972.png)
(Ⅰ)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054424-20885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054424-40741.png)
(Ⅱ)求平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054424-40741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054424-21149.png)
如图,在直三棱柱ABC-A1B1C1中,AC⊥BC,AC=CC1,M为AB的中点。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054419-51903.png)
(Ⅰ)求证:BC1∥平面MA1C;
(Ⅱ)求证:AC1⊥平面A1BC。
如图,在三棱锥P-ABC中,底面△ABC为等边三角形,∠APC=90°,PB=AC=2PA=4,O为AC的中点。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054415-65738.png)
(Ⅰ)求证:BO⊥PA;
(Ⅱ)判断在线段AC上是否存在点Q(与点O不重合),使得△PQB为直角三角形?若存在,试找出一个点Q,并求
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054415-58229.png)
如图,斜三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054403-73952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054404-54505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054404-95726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054404-54505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054404-26859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054404-92417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054405-24944.png)
求证:(1)EF∥平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022054405-65140.png)
(2)平面CEF⊥平面ABC.
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