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普通高中课程标准实验教科书《选修2—1》(人教B版)第二章“圆锥曲线与方程”第五节课后(70页练习B第2题)有这样一道练习题,原题如下:过抛物线的顶点作两条相互垂直的弦OA和OB.求证:弦AB与抛物线的对称轴相交于定点(本文以下都是以y2=2px为例).本题的解法有很多种,在这只列举一种解法.证明不妨设抛物线的方程为y2=2px,设弦
Ordinary high school curriculum standard experimental textbook “Elective 2-1” (people teach the B version) second chapter “Conic Curve and Equation ” after the fifth class (70 exercises B second question) there is such an exercise, the original The questions are as follows: the top of the parabola for two mutually perpendicular strings OA and OB. Verify: the symmetry of the string AB and parabola intersect at a fixed point (in this article are y2 = 2px as an example) There are many ways to solve this problem, In this only enumerated a solution. Prove that we can set the parabola equation y2 = 2px, set string