学习目标1.通过丰富实例,进一步体会函数是描述变量之间的依赖关系的重要数学模型,在此基础上学习用集合与对应的语言来刻画函数,体会对应关系在刻画函数概念中的作用。2.了解构成函数的要素,进一步巩固初中常见函数(一次函数、二次函数、反比例函数)的图像、定义域、值域。 Learning Objectives 1. Through a wealth of examples, we can further understand that a function is an important mathematical model that describes the dependencies between variables. Based on this, we learn to use the set and the corresponding language to describe the function and understand the role of the correspondence in describing the concept of a function. 2. Understand the elements that constitute the function, to further consolidate the image, domain, value range of the common functions of junior high school (primary function, quadratic function, inverse proportion function).