问题描述: 41.2*8.1+11*1.25+53.7*1.9 如何简便计算?(脱式)*是乘号 1个回答 分类:数学 2014-11-05 问题解答: 我来补答 41.2*8.1+11*1.25+53.7*1.9 =41.2*8.1+11*1.25+(41.2+12.5)*1.9 =41.2*8.1+11*1.25+41.2*1.9+12.5*1.9=41.2*(8.1+1.9)+1.25(11+19)=41.2*10+1.25*30=412+37.5=449.5 展开全文阅读