Question

3.2乘以1.25+4.8乘以12.5的简便算法

Answer 1

注意到1.25*8=10

1.25*0.8=1

那么3.2*1.25+4.8*12.5

=4*0.8*1.25+6*0.8*12.5

=4+6*10=64