题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135314-54932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135314-81609.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135314-40897.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135315-67805.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135300-43306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135301-64022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135301-36690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135301-91746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135301-14092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135302-54665.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135302-51921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135302-32262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135300-43306.png)
(Ⅱ)若二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135302-55900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135302-11818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135303-72406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135303-46868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135303-94082.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135256-76215.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135253-43646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135253-76275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135241-24812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135241-71791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135241-58486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135241-34121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135241-22633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-32954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-51585.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-22211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-41037.png)
(2)求多面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-92883.png)
(3)求多面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135242-92883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135243-63014.jpg)
右图为一简单组合体,其底面ABCD为正方形,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135227-45318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135228-46185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135228-79718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135228-50268.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135228-84029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135228-37762.png)
(2)求四棱锥B-CEPD的体积.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021135229-28829.png)
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