1÷= 0×= ÷= 1÷+÷1=
×= ÷= ×= 12×÷12×=
①70%x-70=70
②x-75%x=10
③x=+
3.14×6= 2×3.14×12= + =
0÷20%= 60×30%= 25÷40%=
36× = ÷ = 3× ÷3× =
÷= ÷9= +×3= ×÷×=
100÷10%= 0.45×= ×9×= (+)×24=