3.8*9.9+0.38 简便计算

2025-03-06 21:40:16
推荐回答(2个)
回答1:

3.8*9.9+0.38

=3.8*9.9+3.8*0.1
=3.8*(9.9+0.1)

=3.8*10
=38

回答2:

3.8*9.9+0.38
=0.38×99+0.38
=0.38×100
=38