题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-88770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-88770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-70639.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-70639.gif)
解析
这时准线方程为y=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-15593.gif)
由抛物线定义知
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-15593.gif)
∴抛物线方程为x2=-8y,
这时将点A(m,-3)代入方程,得m=±2
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-40044.gif)
②若抛物线开口方向向左或向右,可设抛物线方程为y2="2ax" (a≠0),从p=|a|知准线方程可统一成x=-
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-84087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185758-54808.gif)
解此方程组可得四组解
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185758-80309.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185758-65810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185758-31630.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185759-58465.gif)
∴y2=2x,m=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-88770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-88770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-70639.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185757-70639.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185705-21105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185705-19421.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185705-80235.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185706-71856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185706-41377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185706-39923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-35240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-94664.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-41616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-99812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-95409.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185640-96008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-58294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-64626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-33557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-43609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-15742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185634-19379.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185607-17180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185607-97464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185607-37940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185607-38873.gif)
(1)求该抛物线上纵坐标为
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185608-81098.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185608-52627.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185608-52287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185608-71546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185609-64715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185609-13413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185541-91232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185541-86143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025185541-45851.gif)
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