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待定系数法是一种重要的数学思想方法 .利用待定系数法求二次函数的解析式 ,是历年中考的一个重要考点 .本文以近年中考试题为例 ,说明如何应用待定系数法求二次函数的解析式 .一、已知函数图象上三点的坐标当已知二次函数图象上三点的坐标时 ,可设其解析式为y =ax2 +bx +
The undetermined coefficient method is an important method of mathematics. Using the undetermined coefficient method to solve the analytic function of the quadratic function is an important test point in the annual examination. In this paper, we took the middle exam in recent years as an example to illustrate how to apply the undetermined coefficient method to find the quadratic function. The analytical formula. First, the coordinates of the three points on the known function image When the three-point coordinates of the quadratic function image are known, the analytical formula can be set to y = ax2 + bx +