题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-69616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-14653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-69616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-14653.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() |
答案
解析
试题分析:垂直于同一条直线的两个平面平行,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-69616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-14653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061034-57824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-69616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061033-14653.png)
点评:面面平行的判定方法:一种方法是面面平行的判定定理,需要证明一个面内的两条相交直线与另一个平面平行;另一种方法是证明这两个平面都垂直于同一条直线.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-88787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-88787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-29205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-29205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-88787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-29205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-26634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
⑤若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-88787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-29205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-29205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-20002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061027-97827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-88787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061026-72185.png)
其中正确命题的序号是 .(把你认为正确命题的序号都填上)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061020-24415.png)
①若α∥β,则l⊥m;②若l⊥m,则α∥β;③若α⊥β,则l∥m;
其中真命题的个数是( ).
A.3 | B.2 | C.1 | D.0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061012-41345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061012-37538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061012-23284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061013-58520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061013-70626.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061005-68708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061006-48839.png)
A.若![]() ![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060954-53311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060954-24410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060954-66744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060954-36220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060954-14920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060955-37279.png)
(Ⅰ)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060955-96849.png)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060955-46780.png)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060955-81544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060955-92611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060956-41148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060956-42895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060956-55559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060956-13637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022060957-26411.png)
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