9.01-0.7=
54÷=
2-55%=
2.5×9×0.4=
0.32-0.22=
3.14×4=
++ =
1÷-÷1=
477﹣199=
5%÷0.01=
36×99=
15﹣+=
5÷﹣÷5=
6.7×0.25×4=
0.4×12.5×8×2.5=
×5÷×5=