计算下面各题,你认为怎样简便就怎样算。0.51×1989.65×0.36-0.36×4.652.6+1.4×31.25×32×2.5答案 解:0.51×198 =0.51×(200-2) =0.51×200-0.51×2 =102-1.02 =100.98 9.65×0.36-0.36×4.65 =0.36×(9.65-4.65) =0.36×5 =1.8 2.6+1.4×3 =2.6+4.2 =6.8 1.25×32×2.5 =(...