3.98+2=
÷ =
3.6× =
+ =
1÷20%=
20×5.5=
﹣ =
0.23=
× =
2.5×12=
4.32比一个数的60%少6,这个数是多少?
10.25× +2.5%
24×
×9.3+9.3×0.25
÷