2.4×=
1.6÷8%=
÷×=
0.25×32×0.125=
-=
3.14×(0.4÷2)2=
2.72+3-2.72+3=
1-0.09=
9﹣ = × = 1÷1%= 1÷ =
7×60%= × = 15.7÷3.14= 63×60%+ ×37=