2.1*9+2.1怎么简算

2024-12-17 16:15:56
推荐回答(2个)
回答1:

2.1*9+2.1
=2.1x(9+1)
=2.1x10
=21

回答2:

=2.1×(9+1)
=2.1×10
=21