二次函数是初中数学的一个难点,也是重点。特别是近几年的中考题,将二次函数和其他知识综合起来,大多数同学更是无从下手。其实同学们在求二次函数解析式时,如果能够灵活运用求二次函数解析式的三个基本式子及掌握一元二次方程和二次函数之间的关系,很多问题将会迎刃而解。一、 The quadratic function is a difficult and important point in junior mathematics. In particular, in the examination questions of recent years, the combination of quadratic functions and other knowledge has made it impossible for most students to start. In fact, when students are seeking quadratic function analytical formulas, if they can flexibly use the three basic equations for solving quadratic function analytic functions and grasp the relationship between one-dimensional quadratic equations and quadratic functions, many problems will be solved. one,