怎样用简便方法计算12乘9.9

2025-04-06 03:40:39
推荐回答(2个)
回答1:

12*10 -12*0.1 =120-1.2=118.8

回答2:

12×9.9
=12×(10-0.1)
=120-1.2
=118.8