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_数学解答

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

人气：339 ℃　时间：2019-09-23 14:08:16

解答

(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