直接写出下面各题的得数.4.8÷0.8= 7.5×0.4= 5.7÷57= 0.75÷15=1÷0.25= 1.2×60= 6÷0.2= 0.21×4=0.62÷0.62﹣1= 5+3.2÷0.8= 7.5÷2.5×0= 0.25×4×9=