高中数学教材中虽然给出了分段函数的定义,但对此类函数的性质未作深入系统地介绍,而在高考试题中却频繁地出现,因此,关注分段函数的性质及其应用很有必要.以下举例说明. Although the definition of a piecewise function is given in the high school mathematics textbook, the nature of such a function is not introduced in depth and systematically. However, it frequently appears in the high exam questions. Therefore, the nature of the piecewise function and its application are very important. It is necessary. The following example shows.