3.9×99要怎样脱式计算?

2024-11-22 09:07:59
推荐回答(2个)
回答1:

3.9×99
=3.9x(100-1)
=3.9x100-3.9x1
=390-3.9
=386.1

回答2:

=3.9*(100-1)=390-3.9=386.1