题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233532-86067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233532-94117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233533-57772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233533-90369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233533-18909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233533-77100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233533-35335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-92480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-71256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-66595.jpg)
答案
解析
试题分析:将四棱锥E-ABCD的侧面AED、DEC、CEB展开铺平如图,连接AB,分别交CE和DE于N、M点,此时的
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-31709.png)
在△ABE中,AB2=AE2+BE2-2AE·BE·cos120°=9,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-31709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233535-93975.jpg)
点评:此题的关键是将三个侧面展开平铺,使
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233535-65622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233534-71256.png)
核心考点
试题【如图所示的几何体中,四边形是矩形,平面平面,已知,若分别是线段上的动点,则的最小值为 ;】;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/20191020/20191020233525-14733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233525-14733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233525-14733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233525-87241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233525-60673.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233517-28342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233517-56539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233517-82823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233517-51726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233518-67373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233518-82678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233518-30264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233518-30264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233518-20035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233450-64218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233450-66541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233450-21162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233450-81427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-93573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-24214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233450-66541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-95373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-30136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-90837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233452-73128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233452-69040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233452-47887.jpg)
(Ⅰ)求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233452-73651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233453-66959.png)
(Ⅱ)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233451-93573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233453-36823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233445-72277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233445-72703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020233446-85527.png)
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