-=
+=
0.5+=
2-=
0.32=
3.1-0.9+0.1=
6.3÷0.07=
0.95-=
0.1×0.2÷0.1×0.2=
x-= x+=1-
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =