%=
208+798=
10-=
27×=
0.064÷0.08=
÷50%=
4.8×0.25×4=
÷=
11.75-1.7=
-4 75% -0.5
÷25%= 20×50%= 4.5÷9%= 40%- =
1×10%= 60%÷ = 87.5%× = 1+8%=
6.75+2.25= 1.02-0.6= 0.7÷0.01= 4.5+ =
2.5×12= 46×10%= + = 4-1÷3=
×=38.5
×=3.85
385÷=0.385
18:15和0.6:0.5 : 和 :2 0.4:0.8和0.5:0.2 16:8和1.2:0.6