19.4×3.2十 2.3的简便方法?

2025-04-05 16:37:54
推荐回答(1个)
回答1:

可以用(20-0.6)×3.2+2.3
=20×3.2-0.6×3.2+2.3
=64-1.92+2.3
=64.38