Question

三又五分之三乘二十五又五分之二加37.9乘六又五分之二（简便运算）

Answer 1

三又五分之三乘二十五又五分之二加37.9乘六又五分之二
=3又3/5×25又2/5+37.9×6又2/5
=3.6×（19+6.4）+37.9×6.4
=3.6×6.4+3.6×19+37.9×6.4
=6.4×（3.6+37.9）+3.6×（20-1）
=6.4×41.5+3.6×（20-1）
=6.4×（40+1+0.5）+3.6×（20-1）
=256+6.4+3.2+72-3.6
=256+72+6.4+3.2-3.6
=328+9.6-3.6
=328+6
=334

Answer 2

三又五分之三乘二十五又五分之二加37.9乘六又五分之二
=3又3/5×25又2/5+37.9×6又2/5
=3.6×（19+6.4）+37.9×6.4
=3.6×6.4+3.6×19+37.9×6.4
=6.4×（3.6+37.9）+3.6×（20-1）
=6.4×41.5+3.6×（20-1）
=6.4×（40+1+0.5）+3.6×（20-1）
=256+6.4+3.2+72-3.6
=256+72+6.4+3.2-3.6
=328+9.6-3.6
=328+6
=334

Answer 3

=3.6×25.4+37.8×6.4
=3.6×25.4+（25.4+12.5）×6.4
=25.4×（3.6+6.4）+12.5×6.4
=254+（10+2.5）×6.4
=254+64+2.5×6.4
=254+64+2.5×4×1.6
=254+64+14
=254+80=334