分段函数在教材中是以例题的形式出现的,并未作深入说明,因此学生对分段函数的认识比较肤浅,理解上有些吃力。由于它在理解和掌握函数的定义、函数的性质等知识的考查上有较好的作用,时常在高考试题中“闪亮”登场,本文就分段函数的有关问题整理、归纳如下。1分段函数的含义所谓分段函数,是指自变量在两个或两个以上不同的范围内有不同的对应法则的函数。对它应有以 Piecewise function in the textbook is an example of the form, did not make in-depth explanation, so the students understanding of the sub-function is relatively superficial, understanding a bit difficult. Because it has a good effect in understanding and grasping the definition of the function and the nature of the function, it often debuts in the entrance examination of the college entrance examination. The paper summarizes the related problems of the piecewise function as follows. The meaning of a piecewise function The so-called piecewise function, refers to the argument in two or more different ranges have different corresponding law function. It should be