3.2a﹣0.2a=
2.8+3.5=
10﹣2.3=
0.25×40=
0.45÷0.3=
1.1×0.9=
1.6÷0.1=
1.5÷0.05=
0÷19.8= 0.2×0.05= 0.6×1.5= 1.36+2.87+3.64=
720.5=36 720.5=144
721.5=108 721.5=48