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求函数的值域是高考的重点和难点,绝大部分值域问题与函数的最大(小)值问题有关系,解答这类问题既要涉及一些具体的解题方法又涉及一些抽象的逻辑方法,下面结合实例谈谈求函数值域的几种常用方法．
Finding the value range of a function is a key and difficult point of the college entrance examination. The vast majority of value domain problems are related to the maximum (small) value problem of a function. To solve such problems, it is necessary to involve some specific problem solving methods and some abstract logical methods. , The following combination of examples to talk about the function of the range of several common methods.