问题描述: (1+1/3)×(1+1/9)×(1+1/81) 简便计算过程,/是分数线,÷是除号 1个回答 分类:数学 2014-11-09 问题解答: 我来补答 (1+1/3)(1+1/9)(1+1/81) =(1-1/3)(1+1/3)(1+1/9)(1+1/81) x3/2=(1-1/9)(1+1/9)(1+1/81)x3/2 =(1-1/81)(1+1/81) x3/2=(1-1/6561)x3/2=6560/6561x3/2=3280/2187 展开全文阅读