0.49÷35*0.6 =0.49÷7÷5×0.6=0.07÷5×0.6=0.014×0.6=0.0084 420/0.8/50 =420/（0.8×50）=420÷40=10.5 44.28/0.9/401 =44.28/3/0.3/401=14.76/0.3/401=492/401.3.24/0.4*0.35=81/0.35=8100/35=162/7