题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034537-63377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034537-50925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034537-65735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034537-44047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-92840.png)
(Ⅰ)求证:DE∥平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-15011.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-22574.png)
(Ⅲ)线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-68427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034539-26911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034539-39583.jpg)
答案
【考点定位】本题第二问是对基本功的考查,对于知识掌握不牢靠的学生可能不能顺利解答,
第三问的创新式问法,难度比较大
解析
(2)可以先证
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034539-22125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034539-52746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-92840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-76296.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-22574.png)
(3)Q为
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034538-68427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034539-22125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-77478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-66493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-27004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-80481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034541-68176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034541-21372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034540-77478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034541-44357.png)
核心考点
试题【如图1,在中,,D,E分别为AC,AB的中点,点F为线段CD上的一点,将沿DE折起到的位置,使,如图2.(Ⅰ)求证:DE∥平面(Ⅱ)求证:(Ⅲ)线段上是否存在点】;主要考察你对向量与空间位置关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034532-70373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034532-89103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034532-83811.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-72240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-99897.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-72240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-72240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-72240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-72240.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-99897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-99897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-99897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-99897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-61047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034524-28843.png)
正确的是( )
A.①② | B.②③ | C.①④ | D.③④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-36006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-16377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-69969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-41980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-61885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-77753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-81822.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-34628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-82100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-40504.png)
(2)是否存在这样的点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034516-61885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-52223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-61134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034517-30420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-64963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-75105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-33518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-12463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-68413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034506-83547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034506-89097.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034452-12314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034452-12314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034453-24896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034453-27995.png)
(1)求证:直线PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
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