题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104455-79225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104455-47759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104455-85236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104455-58620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104456-84548.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104456-55712.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104456-18910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104456-79274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104457-21546.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104457-95285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104457-65206.png)
【考点定位】本题主要考查了抛物线的简单性质及抛物线与直线的关系,当遇到抛物线焦点弦问题时,常根据焦点设出直线方程与抛物线方程联立,把韦达定理和抛物线定义相结合解决问题,属于难题
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-24108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-42415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-67627.png)
(1)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-24108.png)
(2)如果直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-21936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-24108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-86155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104446-58827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104447-84570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104447-57649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104447-16021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104447-84570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-65569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-10535.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-62549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-14701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-71377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104441-57381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104438-94868.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104431-63364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104431-45467.png)
(1)求C的方程;
(2)P为C上的动点,l为C在P点处得切线,求O点到l距离的最小值。
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104427-12541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104427-16775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104427-37697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104427-53275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104428-37501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104427-37697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104428-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104428-34664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024104429-17201.png)
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