1﹣1÷2=
2.5+3.8=
0.4×3.1×2.5=
3.5+2.5= 10﹣0.35= 0.56÷0.7= 20%×5%= 12:2.4=
25×0.8= 9﹣2= 3.75+1= 0÷18= :=