有理数的运算是中学数学运算的基础,同学们在理解有理数的概念及运算法则的同时,还需要掌握一些巧算方法。对于某些数据大、项数多、结构繁的运算需先化简,再根据运算律进行运算。现介绍几种有理数的巧解方法,以帮助同学们提高解题速度和准确率。 The calculation of rational numbers is the basis of mathematics in middle school. Students understand the concept of rational numbers and the algorithms, but also need to master some clever methods. For some of the data is large, the number of items, the structure of the complex operations need to be simplified, and then operate in accordance with the operating law. Several kinds of rational numbers are introduced to help students improve the speed and accuracy of problem solving.