(12.5 +2.5)*0.8*0.4的简便方法

2025-02-14 12:03:39
推荐回答(3个)
回答1:

(12.5 +2.5)×0.8×0.4
=15×0.8×0.4
=15×0.4×0.8
=6×0.8
=4.8

回答2:

原式=15x4/5x2/5=24/5

回答3:

(12.5+2.5)×0.8×0.4
=12.5×0.8×0.4+2.5×0.4×0.8
=10×0.4+1×0.8
=4.8