数是用来表示量的。如果一个数准确无误地表示某一个量,这个数就叫做准确数,也叫准确值。如果一个数只是近似地表示某一个量,这个数就叫做近似数,也叫近似值。例如,某班有学生45人,某工厂有职工572人,某专业户养羊125只,这几个数分别精确地表示了学生数、职工数和羊的只数,它们都是准确数(准确值)。但在实际生产和生 The number is used to indicate the quantity. If a number represents a certain amount of accuracy, this number is called the exact number, also known as the exact value. If a number is only approximate to represent a certain amount, this number is called the approximate number, also called the approximate value. For example, there are 45 students in a class, 572 workers in a factory, and 125 sheep in a specialized household. The numbers respectively indicate the number of students, the number of employees and the number of sheep, which are accurate numbers (accurate value). But in actual production and students