题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102157-73010.png)
A.![]() | B.(1,0) | C.(0,-![]() | D.(-![]() |
答案
解析
试题分析:因为抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102157-30730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102158-44118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102157-33870.png)
点评:解决该试题的关键是将抛物线方程化为标准方程,确定抛物线的开口方向与对称轴.进而得到结论。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-58576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-70498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-19815.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-70498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-19815.png)
(2)请问是否存在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-57057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-19815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102148-44609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-70498.png)
点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102148-68227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102148-83638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102148-46410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102147-57057.png)
理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102137-50992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102137-16399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-16307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-52223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-62499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-52223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-54731.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102137-50992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-54731.png)
(2)请问是否存在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-94075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102138-54731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-69302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102137-50992.png)
两点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-12861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-31499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-93662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102139-94075.png)
存在,说明理由.
给定抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-22280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-12464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-82730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-12464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-32752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-82730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-39210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102124-92166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102124-47024.png)
(Ⅰ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-32752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102124-37127.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102124-35274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102123-32752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102117-56080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102117-57286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024102117-66214.png)
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