1引言函数是贯穿中学数学内容的一根主线,是高中数学的核心内容,更是高等数学后继发展的基础.函数思想是用运动、变化的观点来分析问题中的数量关系,函数概念及其思想方法在数学各个领域的广泛渗透,决定了其在数学课程改革中的重要地位.然而,实践表明:函数概念是学生数学学习中 INTRODUCTION Function is the main line that runs through middle school mathematics content, which is the core content of high school mathematics, which is the basis for the subsequent development of higher mathematics.Function idea is to analyze the relationship between quantity, function concept and its The extensive penetration of the method of thinking in all fields of mathematics has decided its important position in the mathematics curriculum reform.However, the practice shows that the concept of the function is in the students’ mathematics learning