高中物理上册的附录一中讲到有效数字相乘或相除时,提到“积或商的有效数字的位数一般与原来数据中有效数位数最少的相同(有时多一位或少一位)。”括号中的这句话怎样理解?增减位数的标准又是什么?讲清楚这个问题要从误差着手。有效数字的最后一位是不准确量,按四舍五入的原则,它的不确定值为最后一位数的二分之一。以9.8这个数为例,它的不 When appearing in Appendix 1 of the High School Physics Book to multiply or divide the effective numbers, it is mentioned that the number of significant digits of the product or quotient is generally the same as the least significant digit of the original data (sometimes one or less Bit). "How do you understand this sentence in parentheses? What is the standard of increasing or decreasing digits? Make it clear that this problem should be started with error. The last digit of the significant figure is inaccurate. Based on the principle of rounding, its uncertainty is one-half of the last digit. To 9.8 this number as an example, it's not