分段函数是一类重要的函数,它能有效地考查函数的概念、符号及性质.分段函数在现实生活中有着广泛的应用,因而在高考题中备受青睐,本文对高考中的分段函数问题进行归类解析,以便在复习中能系统掌握这一热点内容.一、求自变量的取值范围此类题常用解法是代入求解法,先求各区间上 The piecewise function is an important function, which can effectively examine the concept, symbol and nature of the function. The piecewise function has a wide range of applications in the real life, so it is highly favored in college entrance examination questions. This article points to the college entrance examination. The segment function problem is categorized and analyzed so that the hot topics can be systematically grasped during the review. First, the scope of the value of the independent variables is commonly used to solve the problem is to substitute for the solution method, the first to find the interval