54.9×0.38简便运算。

2023-04-27

问题描述:

54点9×0点三八简便运算




最佳答案:

解法一:

54.9×0.38

=(55-0.1)×0.38

=55×0.38-0.1×0.38

=20.9-0.038

=20.862

解法二:

54.9×0.38

= (55-0.1)(0.4-0.02)

=22-1.1-0.04+0.002

=20.862