比较函数值大小的问题是近几年各地中考的热门考点,笔者认为“切割法”是解决此类问题较好的方法.所谓“切割法”,就是用垂直于x轴(或y轴)的直线(割线)切割同一直角坐标系的函数图象,通过比较割点(割线与函数图象的交点)的高低判断函数值的大小或确定自变量的取值范围,解决函数 The problem of comparing the value of function values ​​is a hottest test point in recent years in various local examinations. The author believes that the “cutting method” is a better way to solve such problems. The so-called “cutting method” is to use perpendicular to the x-axis (or y-axis). Straight line (segmentation) cuts the function image of the same angle coordinate system. The function is determined by comparing the height of the cut point (the intersection point between the secant and the function image) or the value range of the independent variable.