(2009江苏卷)(本题满分10分) 在平面直角坐标系中,抛物线C的顶

(2009江苏卷)(本题满分10分)

在平面直角坐标系中,抛物线C的顶点在原点,经过点A(2,2),其焦点F在轴上。

(1)求抛物线C的标准方程;

(2)求过点F,且与直线OA垂直的直线的方程;

(3)设过点的直线交抛物线C于D、E两点,ME=2DM,记D和E两点间的距离为,求关于的表达式。

答案

【解析】 [必做题]本小题主要考查直线、抛物线及两点间的距离公式等基本知识,考查运算求解能力。满分10分。

     

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