题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082145-79690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082145-56306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082145-92291.gif)
(1)求证: DM∥面PBC;
(2)求证:面PBD⊥面PAC;
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082145-61234.gif)
证明 DM//CG即可;(过程略)
方法二:证明 面DAM//面CB
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082146-48190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082146-52972.jpg)
解析
核心考点
举一反三
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082133-22413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082134-67697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082134-52553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082134-83266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082134-29518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082135-32600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082135-67258.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082128-63014.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082128-99206.jpg)
(Ⅰ)证明:PC ⊥平面BEF;
(Ⅱ)求平面BEF与平面BAP夹角的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082123-73125.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082124-64981.gif)
(I)求证BC
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082124-17829.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082124-75355.gif)
(III)设棱SA的中点为M,求异面直线DM与SB所成角的大小
如图,已知正三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082117-36588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082117-72943.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082118-49501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082118-22216.jpg)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082118-57084.gif)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082118-85887.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082109-44078.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082109-11306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082109-93604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082109-58969.gif)
A
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-30500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-78883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-33790.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-33790.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-78883.gif)
C.若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-16222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-93082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-93082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022082110-16222.gif)
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