有理数的概念及运算是中学生进入初中阶段遇到的第一个基本知识点,它是学习代数式、方程、函数的基础.实践证明,学生运算能力的培养依赖于有理数运算的学习.因此, The concept and operation of rational numbers is the first basic knowledge point that middle school students encounter when they enter junior high school. It is the basis for learning algebraic equations, equations and functions. Practice has proved that the cultivation of students’ computing abilities depends on the learning of rational numbers. Therefore,