题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061400-73889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061400-98802.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-88073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-75884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-36428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-39711.png)
其中正确的个数( )
A.1个 | B.2个 | C.3个 | D.4个 |
答案
解析
试题分析:平行于同一个平面的两个平面一定平行,所以①正确;②中的
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-88276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061402-64128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061401-88276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061402-10722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061402-10722.png)
点评:判断直线、平面之间的位置关系时,要扣紧定理,对定理中特别强调的点一定要仔细判断,多想一些反面的例子.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061350-86349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061350-36243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061350-19328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061351-58152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061351-12925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061351-59118.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061351-17773.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061352-86715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061352-22423.png)
A.垂直于同一个平面的两条直线互相平行 |
B.垂直于同一条直线的两个平面互相平行 |
C.如果平面![]() ![]() ![]() ![]() |
D.若平面![]() ![]() ![]() ![]() ![]() |
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061323-37960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-26444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-91627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-26444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-28296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-56030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-15007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-88927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-13123.png)
(I)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061324-67340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-61708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-10896.png)
(II)当二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-41773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-47750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-91307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061325-86208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061312-64394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061312-13599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061312-67496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061312-88986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061313-23378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061313-79188.png)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061313-31942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061313-51121.png)
(Ⅱ)证明:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061314-26883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061314-84978.png)
(Ⅲ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061314-23294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061314-35954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061305-38296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022061305-31307.png)
A.平面![]() ![]() | B.平面![]() ![]() |
C.平面![]() ![]() | D.平面![]() ![]() |
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