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求二次函数解析式的问题,是近年来中考的重点题型之一。本文以中考中的典型题目为例,介绍二次函数解析式的求法。1 解方程组法 已知函数y=ax~2+bx+c经过A,B,C三点,可将三点坐标代入函数式,列方程组,解之确定a,b,c,求得解析式。 例1.已知二次函数的图象经过A(1,0),B(3,0),C(0,-3)三点,求二次函数的解析式。
The problem of solving the analytic function of the quadratic function is one of the key questions in recent years. This article takes the typical subject in the middle exam as an example to introduce the solution of the analytic function of the quadratic function. A solution equations known function y = ax ~ 2 + bx + c through A, B, C three points, can be three-point coordinates into the function, column equations, the solution of the determination of a, b, c, obtained Analytic. Example 1. Known image of a quadratic function passes through three points A(1,0), B(3,0), and C(0,-3) to find the analytic function of the quadratic function.