123456.6×123456.6-123456.5×123456.7简便计算

更新时间2019-01-24 18:08:39

123456.6×123456.6-123456.5×123456.7

=123456.6×123456.6-（123456.6-0.1）×（123456.6+0.1）

=123456.6×123456.6-（123456.6×123456.6-0.1×0.1）

=123456.6×123456.6-123456.6×123456.6+0.01

=0.01