题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130851-86739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130851-39511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-12836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-12305.png)
答案
解析
试题分析:抛物线y2=4x∴P=2,设经过点F的直线与抛物线相交于A、B两点,,其横坐标分别为x1,x2,利用抛物线定义,
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-56550.png)
AB中点横坐标为x0=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-76959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-76959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130852-76959.png)
点评:解决该试题的关键是先根据抛物线方程求出p的值,再由抛物线的性质可得到答案.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130833-90074.png)
A.(0,-4) | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-33876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-39340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-66038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-33876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-39340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130809-79765.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130809-95989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-11794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-11794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-31075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-11794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-31075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-23156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130808-66038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130810-28446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130811-35835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130811-76039.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130811-88527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130811-99565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130812-23577.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130812-28658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130749-72631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130749-47935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130749-72631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130749-65384.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130749-55509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130750-78345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130706-21153.png)
A.4 x + 1 = 0 | B.4 y + 1 = 0 | C.2 x + 1 = 0 | D.2 y + 1 = 0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130651-96882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130651-77183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130651-72870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130651-75045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025130652-43068.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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