函数是中学数学的重要内容,也是学习大学数学必备的基础。因此,它的重要性不言而喻,但它也是中学数学内容中的难点之一,许多学生学完之后仍然一知半解,难以融会贯通举一反三,没有完全掌握函数的内涵和外延。函数概念是中学数学中的最重要概念之一,函数的思想和方法贯穿高中数学课程 Function is an important part of high school mathematics, but also the basis for learning mathematics in universities. Therefore, its importance is self-evident, but it is also one of the difficulties in the secondary school mathematics content. Many students still know little about it after they finish the study and find it difficult to integrate them from the contrary. They fail to fully grasp the connotation and extension of the function. The concept of function is one of the most important concepts in high school mathematics. The idea and method of function runs through the high school mathematics curriculum