+=
÷2=
1.25×80%=
1÷=
:=
5÷20%=
-=
1.8×=
×11+×7 (+×)÷50% 0.25×4.5×40%
7.8÷0.2=
×2-3.5=
12×(-)=
-+=
4×(1-10%)=
-62.5%=
+50%=
÷+×2=
9.01-0.7=
54÷=
2-55%=
2.5×9×0.4=
0.32-0.22=
3.14×4=
++ =
1÷-÷1=
×(+)÷ 37×60%+×37+37 ÷[(+)×]