问题描述： 3又五分之三×25又五分之二+37.9×6又五分之二要求用简便算法 1个回答 分类：数学 2014-09-29 问题解答： 我来补答 (3+3/5)×(25+2/5)+37.9×(6+2/5)=3.6×25.4+37.9×6.4 =3.6×25.4+(25.4+12.5)×6.4 =3.6×25.4+25.4×6.4+12.5×6.4 =3.6×25.4+25.4×6.4+12.5×8×0.8 =25.4×(3.6+6.4)+100×0.8 =254+80 =334 展开全文阅读
