分段函数是一类特殊的函数,在近年各地的高考试题中频繁出现.在整个高中新教材体系中,只有在必修①中是通过例2、例3给出了分段函数的概念(在定义域的不同部分上,有不同的解析式),并没有作深入的论述,不少同学在处理此类题目时常出错,现就分段函数的相关内容进行分类讨论,供同学们参考. Segmentation function is a special kind of function that appears frequently in high test questions in various places in recent years. In the whole new high school textbook system, only in the compulsory example 1 is the concept of the piecewise function given in Example 2 and Example 3 ( Different parts of the definition domain have different analytical formulas, and there is no in-depth discussion. Many students often make mistakes when dealing with such topics. Now we discuss the related contents of the segmented functions for classmates’ reference.