题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120819-26507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120819-26507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120819-79942.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120820-79734.png)
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120820-70524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120820-98862.png)
核心考点
举一反三
A.V1比V2大约多一半 | B.V1比V2大约多两倍半 |
C.V1比V2大约多一倍 | D.V1比V2大约多一倍半 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120810-88334.png)
(Ⅰ)证明:平面ADB⊥平面BDC;
(Ⅱ)设BD=1,求三棱锥D﹣ABC的表面积.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120734-47188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-25253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-25288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-30516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-25253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-78723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-30830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120735-34247.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120741-14176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120741-49210.png)
(2)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120741-29245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120742-70139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120723-56885.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-17123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-39302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-52022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-62026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-51619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120715-14228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-45526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-37288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-35579.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-18221.png)
(2)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-60927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021120716-42739.png)
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