越快越好1 7.2*61.3+73.8*2.82 1-(16+17)*233.6/8+33.6/871.25*615+3.8/45

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越快越好1 7.2*61.3+73.8*2.82 1-(16+17)*233.6/8+33.6/871.25*615+3.8/45

越快越好1 7.2*61.3+73.8*2.82 1-(16+17)*233.6/8+33.6/871.25*615+3.8/45
越快越好
1 7.2*61.3+73.8*2.8
2 1-(16+17)*233.6/8+33.6/871.25*615+3.8/45

越快越好1 7.2*61.3+73.8*2.82 1-(16+17)*233.6/8+33.6/871.25*615+3.8/45
1,原式=7.2×61.3+4.1×9×2×0.4×7=7.2×61.3+﹙9×2×0.4﹚×﹙4.1×7﹚
=7.2×﹙61.3+28.7﹚=7.2×90=648
2,原式=