题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-83410.gif)
如题19图,平行六面体
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-68839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-34690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-71181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-10436.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080545-88308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080544-34690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080545-12802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080545-33066.gif)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080545-77475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080546-40104.gif)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080546-57485.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080546-72423.jpg)
解析
核心考点
举一反三
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080525-33014.gif)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080511-92025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080511-88271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-55173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-32236.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-21867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-50264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-81483.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080511-92025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080513-85699.gif)
(1)若异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080513-23740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080513-90989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080513-52262.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080514-49973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080514-72050.gif)
(2)在(1)的条件下,设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080514-85318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080513-23740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080512-55173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080514-22991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080514-30521.gif)
(3)在(2)的条件下,求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080515-43688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080444-21827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080444-47202.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080444-54177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080445-81577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080444-21827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080445-67426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080445-97892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080445-77315.gif)
(Ⅰ)若点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080445-30218.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080446-97999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080446-80798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080446-34437.gif)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080446-10473.gif)
(Ⅲ)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080447-35278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080447-10724.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080447-35278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080447-85244.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080447-66140.gif)
长方体
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080430-86332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080431-31246.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080431-31452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080431-58388.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080431-21798.jpg)
(Ⅰ) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080431-34802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080432-91889.gif)
(Ⅱ) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080432-18533.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080432-91889.gif)
(Ⅲ) 求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080433-71108.gif)
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