题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005152-68558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005152-15059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005153-65977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005153-77944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005153-97824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005153-52054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-80288.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-46211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-39084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-53288.png)
(2)当三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-72991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005153-52054.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-30648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-46548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-49249.png)
解析
试题分析:(1)求异面直线所成角,关键在平移,即将空间角转化为平面角.利用中位线实现线线之间平移. 连
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-50220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005152-68558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-78309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-99877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-97045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-39084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-53288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-74621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-60142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-72991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-72991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-18178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-18178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-18178.png)
试题解析:解:(1) 连
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-50220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005152-68558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-78309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-14605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-39177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-85825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005158-35101.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005158-41646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005158-64186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005158-38842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-99877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-97045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-39084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-53288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-93571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-74621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-18849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-97400.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-18849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-98631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-74827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005200-75345.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005200-96455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005200-26882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005200-55633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005200-42666.png)
综上异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-39084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-53288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-30648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-46548.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005159-93571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-72991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005201-55966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005201-98921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005154-72991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-18178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005201-15657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005157-18178.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005201-76615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005202-45469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005156-68831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005202-54906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005155-49249.png)
核心考点
试题【已知圆锥母线长为6,底面圆半径长为4,点是母线的中点,是底面圆的直径,底面半径与母线所成的角的大小等于.(1)当时,求异面直线与所成的角;(2)当三棱锥的体积最】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005142-84273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005142-98720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005142-14998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005142-54474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005142-46529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005143-68730.png)
(1)求证:;
(2)求二面角B-AC-D的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005127-80226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005127-60903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005127-61582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005127-69884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005128-11124.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005107-17167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005107-95488.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005100-34280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005100-50127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005100-55836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022005100-16320.png)
A.![]() | B.![]() | C.![]() | D.![]() |
A.![]() | B.![]() | C.![]() | D.![]() |
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