题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034506-74588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-18935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-34404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-93683.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-70180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-19627.gif)
(1)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17351.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-13989.gif)
(3)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-19627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-85501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-25825.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-40992.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-54130.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-40271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-57999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-27575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-55205.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-38278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-30113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034511-71210.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-27575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034511-83199.jpg)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-27575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034511-55229.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034506-74588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-18935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034511-19351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-28269.gif)
∴△
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-27966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-99690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-17351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-40992.gif)
(2)由(1)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-11098.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-72335.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-39544.gif)
∴点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-70180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-76245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-19627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-76245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-86951.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-76245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034510-55205.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-70180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-14133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034514-85181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034514-21356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-70180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034513-76245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034512-27966.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-18935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034514-97816.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034507-19627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034508-85501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034509-54130.gif)
核心考点
试题【如图,已知是正三棱柱(底面为正三角形,侧棱垂直于底面),它的底面边长和侧棱长都是.为侧棱的中点,为底面一边的中点.(1)求异面直线与所成的角;(2)求证:;(3】;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
如图,圆锥的顶点是S,底面中心为O.OC是与底面直径AB垂直的一条半径,D是母线SC的中点.
(1)求证:BC与SA不可能垂直.
(2)设圆锥的高为4,异面直线AD与BC所成角的余弦值为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034500-36284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034500-69073.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034445-56898.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034445-20836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034446-12906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034446-34677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034446-77786.gif)
(1)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034446-27482.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034447-85208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034447-82019.gif)
(3)证明面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034447-52778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034447-79514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034448-35878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034448-76363.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034432-88368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034432-42010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034432-24356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034432-34291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034432-88368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034433-17519.gif)
A.3倍 | B.27倍 | C.3![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034414-31799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034414-75110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034414-29938.gif)
E是CD的中点,PA
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034414-59609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034415-87202.gif)
(I)证明:平面PBE
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034414-59609.gif)
(II)求二面角A—BE—P和的大小。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034415-10721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034415-90058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021034415-46554.gif)
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