题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074340-89044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074340-26959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074341-54491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074341-72055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074341-85163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074341-19766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074341-30219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074342-34571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074342-38737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074342-18486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074342-22629.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-91087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11360.png)
(2)求平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-58726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11360.png)
(3)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-69866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-58726.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074344-40069.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074344-51031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074344-30321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11360.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074344-66256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074345-68194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074345-82971.png)
(2)分别以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074345-54629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074345-95569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074345-92521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074346-93634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074346-88110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074346-12153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-58726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074347-46677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074347-86951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074347-49279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-11360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074347-35722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074347-13911.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074348-93770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074343-58726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074348-97777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074348-89074.png)
点评:此类问题常考查空间中平行关系与垂直关系的证明以及几何体体积的计算,这是各类考试的重点内容.证明的关键是熟练掌握并灵活运用相关的判定定理与性质定理
核心考点
试题【如图(1),在等腰直角三角形中,,点分别为线段的中点,将和分别沿折起,使二面角和二面角都成直二面角,如图(2)所示。(1)求证:面;(2)求平面与平面所成的锐二】;主要考察你对空间几何体的视图与直观图等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074337-13276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074333-86200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074329-43815.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074325-76184.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021074321-89829.png)
A.8 | B.![]() | C.![]() | D.4 |
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