6.2×9.9用简便计算法怎么算?

2024-11-25 20:19:37
推荐回答(3个)
回答1:

6.2×9.9
=6.2×(10-0.1)
=6.2×10-6.2×0.1
=62-0.62
=61.38

回答2:

6.2✘(9+0.9)

回答3:

(6+0.2)✘(10-0.1)