9.9×8.990 3.5÷0.43.5×0.4
1.6÷1.051.6 8.1÷0.0981÷0.9 2.45×3.23.2×2.45
0.8×0.5= 1.47+2.3= 4÷0.2= 0.1-0.1×0.1=
0.25÷0.5= 56×0.1= 6.24÷0.6= 0.25×4÷0.25×4=
小皮球的单价是多少?