求二次函数的解析式时,由于其类型繁多,灵活性强,若能选用恰当的解题方法,往往能收到事半功倍的效果,本文就2002年部分省市中考题分类例说。一、三点型若题设条件是二次函数图象上的三个非特殊点(顶点、与x轴的交点)的坐标时,则可用一般式y=ax2+bx+c。 When solving the analytic function of the quadratic function, due to its variety of types and flexibility, if you can choose the appropriate problem solving method, you can often receive a multiplier effect. This paper presents examples of the examination questions in some provinces and cities in 2002. One-and-three-point type If the condition is set to the coordinates of three non-special points on the quadratic function image (the intersection of the vertex and the x-axis), the general formula y=ax2+bx+c can be used.