函数的值域及其求法是高中数学的重点内容之一,很多问题的展开都需要围绕着对它的探讨来进行。而学生在学习这些知识的过程中,教师在不同阶段零零碎碎的讲解,学生感到理解较难,很难在整体上把握好。而方法运用是否适当,将关系到解题过程中是否能起到简化运算过程,避繁就简,事半功倍的作用。 The range of function and its solution is one of the key contents of high school mathematics. Many problems need to be explored around its discussion. Students in the process of learning this knowledge, teachers at different stages of fragmentary explanation, students feel more difficult to understand, it is difficult to grasp the overall good. The appropriate use of methods will be related to the problem-solving process can play a simplification of the operation process, to avoid complications, to do more with less.