题目
题型:不详难度:来源:
已知空间三点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011538-89711.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011538-95491.gif)
(2)求以AB,AC为边的平行四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011538-95248.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011538-39096.jpg)
解析
核心考点
举一反三
如图,正方体
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-80482.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-58194.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-79493.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-93524.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-41853.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011532-88045.gif)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011518-16510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011518-49199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011519-47142.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011519-93698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011519-41921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-64787.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011519-41921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-64787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-31164.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-94187.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011519-41921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-31265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011520-53541.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011521-49235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011521-31791.gif)
如图2,在四面体
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-51783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-21308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-76975.gif)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-36591.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-26658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-61797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011452-43485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011453-95959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011453-50945.gif)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011453-24509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011453-13388.gif)
ABCD为矩形,CF⊥平面ABCD,DE⊥平面ABCD,AB=4a,BC= CF=2a,DE=a, P为AB的中点.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011441-87732.gif)
(1)求证:平面PCF⊥平面PDE;
(2)求证:AE∥平面BCF.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011437-46686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011437-71775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011437-22283.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011437-45964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011438-44884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106011437-71775.gif)
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