题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062042-59515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062042-62792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062042-82535.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062042-62211.png)
解析
AB1⊂平面AB1D1,AD1⊂平面AB1D1,AB1∩AD1=A
C1D⊂平面BC1D,BC1⊂平面BC1D,C1D∩BC1=C1
由面面平行的判定理我们易得平面AB1D1∥平面BC1D
故答案为:平行
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062034-20520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062029-56492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062029-53404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062030-86412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062030-47314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062030-80407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062024-73205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062025-90294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062025-69801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062025-45956.png)
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-24952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-66250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-80597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-19260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-80597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-46933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062013-75505.png)
(1)求证:平面ADE⊥平面ABE;
(2)求二面角A—EB—D的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062014-55861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062004-79125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062004-76399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062004-85920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062005-63652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062005-44960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062005-24308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062005-22314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062006-35321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062004-76399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022062006-24936.png)
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