1.6×0.5= 3.65-0.45= 6.4÷8+0.7= 3.2×9+3.2=
3.22÷0.2= 4.36×2.7×0= 5.3-0.7-0.3= 4.5×7+5.5×7=
①0.83+1.675 ②756+1328 ③+ ④57%+