7.2×99=?用简便方法计算脱式计算

2024-11-22 08:17:42
推荐回答(2个)
回答1:

=7.2x(100一1)
=7.2x100一7.2x1
=720一7.2
=712.8

回答2:

7.2x99
=7.2x(100-1)
=7.2x100-7.2x1
=720-7.2
=712.8