如题所述
第1个回答 2021-01-31
(12.5 +2.5)×0.8×0.4
=15×0.8×0.4
=15×0.4×0.8
=6×0.8
=4.8
=15×0.8×0.4
=15×0.4×0.8
=6×0.8
=4.8
第2个回答 2019-10-01
(12.5 +2.5)×0.8×0.4
=15×0.8×0.4
=15×0.4×0.8
=6×0.8
=4.8本回答被网友采纳
=15×0.8×0.4
=15×0.4×0.8
=6×0.8
=4.8本回答被网友采纳
第3个回答 2019-10-01
原式＝15x4／5x2／5＝24／5
第4个回答 2019-10-01
（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
=12.5×0.8×0.4+2.5×0.4×0.8
=10×0.4+1×0.8
=4.8
