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近似数的精确度与有效数字是同学们学习中的一个难点,学好并掌握这两个概念,要注意以下几点. 一、正确理解近似数的精确度与有效数字的概念 一个近似数,四舍五人到哪一位,就说这个近似数精确到哪一位. 四舍五入以后的近似数,从左边第一个不是0的数字起,到精确到的数位止,所有的数字,都叫这个数的有效数字.
The precision and number of approximate numbers is a difficult point for students to learn. To learn and master these two concepts, pay attention to the following points. First, the correct understanding of the accuracy of the approximate number and the concept of the effective number of an approximate number, four Which one of the five people to go to say exactly which one is the approximate number. Rounded to the nearest number, from the first number on the left, which is not 0, to the exact number, all numbers are called this The effective number of digits.