函数是学生进入高中阶段接触到的第一个比较抽象的概念 ,难以理解 .学习函数时如果对概念的内涵理解不深刻或有偏差 ,就会造成对某些问题是非辨别不清 ,导致种种错误 ,影响对后续知识的掌握 .下面就函数中的“域”、“范围”、“有意义”几个易混的概念举例辨析如下 例 1　若 The function is the first abstract concept that students encounter when they enter high school. It is difficult to understand. When learning a function, if the understanding of the concept is not profound or biased, it will result in non-clearness of certain issues, resulting in various errors. , affect the mastery of the follow-up knowledge. The following on the function “domain”, “range”, “meaningful” a few examples of the concept of easy to confuse the following example 1