函数是研究客观世界变化规律的一个重要模型,也是中学数学的核心概念。初中里,函数是学生数学认识上的一次飞跃,从常量数学转变到变量数学,学生对函数概念的形成和掌握都有一定难度。教师在设计和组织《认识函数》的教学中,都会遇到同一个疑问——如何对函数概念进行归纳和剖析?本文以函数概念的关键语为着力点,一一剖析,逐个击破,力求攻破教学的重难点。 Function is an important model to study the law of change in the objective world. It is also the core concept of high school mathematics. In junior high school, the function is a leap forward in mathematical understanding of students. From constant mathematics to variable mathematics, students have some difficulty in the formation and mastery of function concepts. Teachers in the design and organization of “cognitive function” teaching, will encounter the same question - how to summarize the function concepts and analysis? This article focuses on the concept of function key words, one by one analysis, one by one break, and strive to break Teaching hard and difficult.