题目
题型:不详难度:来源:
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-29075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-45922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-45922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-14670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-86042.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-13773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-91761.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-92426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-78693.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-67972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-64208.gif)
(2)平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-53463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-93240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-59824.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-80491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-86377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-68771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-63787.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-91761.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-56418.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-93240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-86377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-67972.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-67972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-72568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-12568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013937-86377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-77245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-12568.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-67972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-12568.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-39107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013938-55609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-14670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013939-38457.gif)
平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013939-77985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013939-72129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013939-22344.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013934-14670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013940-50025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013940-34696.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013940-87672.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013940-22840.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013941-53771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013941-33594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013941-27510.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013941-39813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013941-37367.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013935-92426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013942-19271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013942-32240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013942-16060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-93240.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013942-77244.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-64208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013943-86448.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-53463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013936-93240.gif)
解析
核心考点
试题【(本小题满分14分)如图,在四棱锥中,底面为矩形,平面⊥平面,,,为的中点,求证:(1)∥平面;(2)平面平面.】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013930-53619.png)
A.![]() | B.![]() | C.![]() | D.![]() |
如图所示,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013921-87449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013922-72981.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013922-79869.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013922-43307.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013922-71195.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013922-50739.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013923-57472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013923-19853.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013923-57472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013923-63879.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013923-24556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013924-40168.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013924-47686.gif)
如图的多面体是底面为平行四边形的直四棱柱ABCD—
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013914-75000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013914-17313.jpg)
(I)求证:BD⊥平面ADG;
(Ⅱ)求平面AEFG与平面ABCD所成锐二面角的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013915-35749.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013903-10210.gif)
在三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013903-15174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013903-70823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013904-57732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013904-99726.gif)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013904-80517.gif)
(2)求二面角N-CM-B的大小;
(3)求点B到平面CMN的距离。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013858-62566.gif)
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