题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050436-61512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050436-67499.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() |
答案
解析
试题分析:若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050436-84199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050437-90764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050437-28486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050436-67499.png)
结合锐角的二面角,一个面内的直线垂直于棱,可知B不正确;
若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050438-49084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050438-25939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050437-90764.png)
由垂直于同意一平面的直线平行,知d正确,故选D.
点评:简单题,熟记定理、法则是基础,灵活借助于模型是技巧。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050416-67592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050416-56234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050416-38350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050416-82644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-82746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-17838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-29246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-77158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-15409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-19610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-28268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-43220.png)
(1)求双曲线的离心率;
(2)过双曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050417-77158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-27768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-41765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050418-10372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050419-97199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050419-79115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050419-70347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050355-58290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-45599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-10226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-28523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-83899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-84070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050356-82719.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050357-31201.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050357-36590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050357-72886.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022050349-93324.png)
A.90° | B.60° |
C.45° | D.30° |
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