问题描述: 41.2*8.1+11*1.25+53.7*1.9简便计算 1个回答 分类:数学 2014-11-25 问题解答: 我来补答 41.2*8.1+11*1.25+53.7*1.9=41.2*8.1+53.7*(10-8.1)+11*1.25=41.2*8.1+53.7*10-53.7*8.1+11*1.25=53.7*10-(53.7-41.2)*8.1+11*1.25=537-12.5*8.1+1.1*12.5=537-12.5*(8.1-1.1)=537-12.5*7=537-87.5=449.5 展开全文阅读