8﹣5.3= + = 0.2×0.01= 2÷ = 0.82﹣0.08=
1﹣ = 20×3.5= × = ÷0.2= 0.04×50=
989998 3个0.130个百分之一
3.7×1.0 10.9×3.7 n÷0.9(n>0)