28乘29乘30减28乘29乘5减25乘28乘29的简便算法还有11111乘99999

问题描述:

28乘29乘30减28乘29乘5减25乘28乘29的简便算法
还有11111乘99999

28乘29乘30减28乘29乘5减25乘28乘29 =28×29×(30-5-25) =28×29×0 =0 11111乘99999 =11111×11111×9 =123454321×9 =1111088889