题目
题型:不详难度:来源:
正三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030029-97849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030029-34559.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030030-24660.gif)
截面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030030-39222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030030-76761.gif)
②求几何体Ⅰ和几何体Ⅱ的体积之比.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030030-18262.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030030-91747.gif)
解析
核心考点
试题【(本小题12分)正三棱柱中,所有棱长均相等,分别是棱的中点,截面将三棱柱截成几何体Ⅰ和几何体Ⅱ两个几何体.①求几何体Ⅰ和几何体Ⅱ的表面积之比;②求几何体Ⅰ和几何】;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/20191021/20191021030023-22611.gif)
已知斜三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030023-86026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030023-58795.gif)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030023-21939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030024-58654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030024-47808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030024-53048.gif)
①求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030024-69023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030025-71869.gif)
②求点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030024-58654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030025-41238.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030016-86276.gif)
四面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030016-31066.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030016-79452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030016-48901.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-37830.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-56998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-44375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-15807.gif)
①求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-79013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030017-15807.gif)
②求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030018-32562.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030006-24775.jpg)
如图,在底面为平行四边形的四棱锥P—ABCD中,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030006-92056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030006-65837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030007-59185.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030007-17408.gif)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030007-61134.gif)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030007-71659.gif)
(3)求二面角E—AC—B的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030002-33072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030002-98770.gif)
经过点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030002-98770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021030002-44729.gif)
A.![]() | B.![]() |
C.![]() | D.无数条 |
![]() |
‘
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025952-43095.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025953-14681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025953-88359.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025953-49266.gif)
别是
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025953-75283.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025953-28617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025954-89022.gif)
(2)平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025954-68053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025954-23496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021025954-86585.gif)
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