一次函数是初中数学的核心内容之一,主要研究事物变化过程中的数量关系和变化规律,几乎是所有中考数学试卷中不可或缺的内容,且试题立意日趋新颖,不仅有效地考查了学生的数学基础知识和基本技能,还有效地考查了学生应用数学知识解决实际问题的能力.本文以近几年中考试题中的一次函数应用题为例,加以说明. The primary function is one of the core contents of junior high school mathematics. It mainly studies the quantitative relationship and the law of change in the course of things. It is almost an indispensable part of all the mathematics examination papers for senior high school students, and the idea is increasingly novel, which not only effectively examines the students’ The basic knowledge of mathematics and basic skills also effectively examine the students’ ability to apply mathematics knowledge to solve practical problems. This paper uses the example of a function of a mid-test question in recent years as an example to illustrate.