2.4X15-12x0.5怎样简便怎样计算?

2025-03-11 03:40:15
推荐回答(2个)
回答1:

12x0.2x15一12×0.5
12×(3一0.5)
12x2.5
12×5×0.5
60×0.5
30

回答2:

2.4X15-12x0.5
=2x15+0.4x15-6
=30-6+6
=30