题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122743-48837.png)
答案
解析
试题分析:设正方体的边长为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122743-34969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122743-71344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122743-35155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122744-11329.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122726-96741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122727-73960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122727-69692.jpg)
有如下结论:
①
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122727-98150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122727-62965.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122728-66508.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122728-55845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122728-41928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122728-43611.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122728-84463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122729-33827.png)
其中正确的结论是 (请填上你所有认为正确结论的序号).
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122713-63693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122713-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122713-43543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122713-11095.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122713-91683.png)
(2)求证:AF
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122714-52342.png)
(3)求三棱锥E-BCD的体积.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-71636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-75764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-49657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-27234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-33326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122656-22188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122656-76604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122656-34466.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122656-66947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122655-49657.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122657-80153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122657-88409.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122657-34506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122657-62751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122634-62670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122634-41158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122634-63623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122634-48785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122635-74233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122634-41158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122635-71292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122635-44880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122635-59432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122636-99908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122636-26767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122636-55133.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122636-44537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122637-87775.png)
(2)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122637-34172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122630-38467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021122630-38733.jpg)
A.2 | B.![]() | C.![]() | D.![]() |
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