题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010708-81820.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-92585.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-19254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-26939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-17952.gif)
为四面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010708-81820.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-22056.gif)
①不存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-17952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-69636.gif)
②不存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-17952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-69636.gif)
③存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-17952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-23033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-39917.gif)
④存在无数个点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010709-17952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010711-21346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010710-69636.gif)
其中真命题的序号是 .
答案
解析
核心考点
试题【如图,四面体的三条棱两两垂直,,,为四面体外一点.给出下列命题.①不存在点,使四面体有三个面是直角三角形;②不存在点,使四面体是正三棱锥;③存在点,使与垂直并且】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010704-98159.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010704-55542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-70472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-94414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-15413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-56654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-61395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010705-66606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010706-72172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010706-49356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010706-99077.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010655-67527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010656-20133.gif)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010656-52804.gif)
(II)求二面角B—AC—E的正弦值;
(III)求点D到平面ACE的距离。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-17552.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-33213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-65443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-25971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-71126.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-54125.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-99734.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-73905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010638-60668.gif)
(1)证明:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010639-92663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010639-88983.gif)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010639-47526.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-53331.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-57316.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-31243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-25891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-31243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-27942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-50763.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-29291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-79780.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-93115.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-61153.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-30697.gif)
(1)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-51995.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010626-31243.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-72212.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010627-46548.gif)
(3)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010628-75739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010615-66109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010615-39317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010615-99643.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-37873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-37873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-71169.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-63613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-51015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010616-97560.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010617-70586.gif)
(1)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010617-60925.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010617-74024.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010617-95528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010617-74024.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010618-93510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021010618-24211.gif)
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