口算20道0.8×257.4×1000.7×50.9×110.96×0 0.02×50012.5×8 0.3×10 1.4×31.12×20.39×104.1×61.9×8 2.3×5 4.3×52.9×33.6×27.3×41.2×54.5×5竖式20道7.3+3.8×2.3= &n...