数学须阅读课本，而阅读课本时，简单例题最易于被忽视。因为简单，以为一望可解，没有推敲的必要。实际上并非如此，虽然有些例题的过程简单，甚至只直接给出答案，可要把握解题的思路有时却很不容易。现行中师数学教材中，紧接着反函数概念编排的一例1”（《代数与初等函数》 Mathematics must read textbooks, and when reading textbooks, simple examples are most easily overlooked. Because of simplicity, I think there is no need for scrutiny. This is actually not the case, although some examples of the process is simple, or even give answers directly, but it is sometimes difficult to grasp the idea of ​​solving problems. An Example of Arrangement of Inverse Function Concepts in Current Normal Mathematics Textbooks (“Algebra and Elementary Functions”