题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124100-69148.png)
解析
试题分析:设长方体的边长为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124100-35919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124100-53577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124100-58622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124101-94245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124100-69148.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-18719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-28668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-40079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-64727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-42019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-31557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-10723.jpg)
(1)证明:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-25427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124046-84147.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-64727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124046-10029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124046-54209.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124046-83547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124045-18719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124036-49679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124036-39058.png)
(1)求证:OF∥平面ACD;
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124036-64051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124030-74215.png)
A.5 | B.10 |
C.20 | D.30 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021124019-58686.jpg)
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