三十点4×1点9-1点九怎么简算

怎么简算不知道
2025-05-20 18:55:02
推荐回答(1个)
回答1:

30.4×1.9-1.9
=(30.4-1)×1.9
=29.4×(2-0.1)
=58.8-2.94
=58.8-3+0.06
=55.86

望采纳