2.5×1.9的简便计算

2.5×1.9的简便计算
2025-04-05 13:22:29
推荐回答(1个)
回答1:

2.5×1.9的简便计算
=2.5×(2-0.1)
=2.5×2-2.5×0.1
=5-0.25
=4.75