<<<<
30.6÷8.5=
0.306 ÷0.85=
0.36 ×85=
36×8.5=
30.6 ÷850=
306 ÷0.36=
①39.9×9.9 ②400.009÷0.09
③799×0.5 ④12.5×40×0.81
-5 2 4 -3
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =