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

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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
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

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
(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