题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050215-15829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050215-33248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-61021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-92054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-46284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-32709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-32709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-92054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-46284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-39256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-39256.png)
A.4 | B.3 | C.2 | D.1 |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-61021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-92054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-46284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-32709.png)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-61021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-32709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-46284.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-61021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-39256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-61021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-52875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050217-28371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050216-39256.png)
点评:基础题,常考题型,构建几何模型,牢记有关定理是关键。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050206-97195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050206-24943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050206-35024.png)
(Ⅰ)求证:CF∥面ABE;
(Ⅱ)求证:面ABE ⊥平面BDE;
(Ⅲ)求该几何体ABECD的体积。
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-37022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-24295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-33861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-98536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-66591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050156-84302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-37283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-40523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-30356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-79158.jpg)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-84479.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-77713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-25726.png)
(Ⅲ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050157-81563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050146-30895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050146-29344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050146-56815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050146-70503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050147-60781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050147-86862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050147-36622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050147-89560.png)
A.1条 | B.2条 | C.3条 | D.无数条 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050135-19018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050135-77643.jpg)
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