题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101553-45470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101553-28296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101553-31577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101553-57092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101554-49547.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101554-16409.png)
解析
试题分析:设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101554-71132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101554-89368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101555-69876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101555-14720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101554-16409.png)
点评:直线与圆锥曲线相交时常联立方程组,将所求问题转化为与两交点坐标相关的问题
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101545-41797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101545-14601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101546-65942.png)
(I)求y1y2的值;
(Ⅱ)求讧:|PM|="|" PN|
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101541-81739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101542-30758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101537-37972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101537-21796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101524-83559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101525-59843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101525-37924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101525-29660.png)
(1)求抛物线方程;
(2)设动直线l与抛物线E相切于点P,与直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101525-28931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-35244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-26997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-95573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-60510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-29268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-16488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-95573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-16488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-35244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-35834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-37082.png)
(Ⅰ) 求抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-35244.png)
(Ⅱ) 当点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101510-55073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-95573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101510-21073.png)
(Ⅲ) 当点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101509-16488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101508-95573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101510-55880.png)
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