求二次函数的解析式是“函数”部分的难点.课本中对这个问题没有做深入的讲解,同学们解题时常感困难.本文举例分析二次函数解析式的几种求法,供同学们参考.一、三点型若已知抛物线上三点的坐标,则二次函数的解析式可用一般式y=ax2+bx+c(a≠0)来表示,然后用待定系数法将三点坐标 The analytical formula of the quadratic function is a difficult part of the “function” part. The textbook does not provide in-depth explanations on this issue, and students often feel difficult to solve the problem. This article gives an example of the analysis of quadratic function analytical methods for students. Reference. One and three-point type If the coordinate of the three points on the parabola is known, the analytical expression of the quadratic function can be expressed by the general formula y=ax2+bx+c(a≠0), and then use the undetermined coefficient method to three points. coordinate