题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-53991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-24455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-94718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-20197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-41121.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-67791.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-24455.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-70053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021802-48937.gif)
连接OB、
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021802-47845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021802-12939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021802-45206.gif)
有
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021803-97805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021803-48310.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021803-40347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021803-34759.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021803-73083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021804-71588.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021804-10053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021804-27976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021804-57241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-20197.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-67578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-24085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-51863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-50510.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-67578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021805-40974.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021806-28456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021806-52726.gif)
已知平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-94718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-20197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-41121.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021806-89257.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-41121.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021806-85256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021801-41121.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021807-44936.gif)
于是点N是线段
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021800-24455.gif)
核心考点
试题【 已知正三棱柱的侧棱长和底面边长均为2, N为侧棱上的点,若平面与平面所成二面角(锐角)的余弦值为,试确定点N的位置。】;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/20191021/20191021021758-58195.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021758-58195.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021759-15204.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021759-72440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021759-77743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021759-56801.gif)
已知一四棱锥P-ABCD的三视图如下,E是侧棱PC上的动点。
(1)求四棱锥P-ABCD的体积;
(2)若点E为PC的中点,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021734-72552.gif)
(3)是否不论点E在何位置,都有BD⊥AE?证明你的结论。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021734-83032.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021734-49544.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-78700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-76358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-58976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-86221.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021729-10518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021729-11850.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021729-62011.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021729-25807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-76358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-93046.gif)
(1)判断翻折后直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021728-58976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-34574.gif)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-15087.gif)
(3)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-54321.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-34574.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021730-43302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021731-74142.gif)
图 ① 图 2
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021711-64390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021711-17314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021711-71829.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021712-30709.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021712-64296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021712-35914.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021712-75579.gif)
(2) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021712-71240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021713-51252.jpg)
如图,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021656-57672.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021656-40932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021657-96679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021657-97838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021656-40932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021657-29101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021657-12923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021656-40932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-62715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-87915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-79937.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-70456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021657-96679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021656-40932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-87915.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021658-82716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021021659-62681.jpg)
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