280.5=14 282.5=11.2
274.5=6 280.5=56
1.86÷0.971.86 8.42×1.018.42
3.6÷0.436÷4 12.3×0.9912.3÷0.99
145+398= 6-0.6= 0.24×50= 3﹣3÷7= (+)×56=
1.25×6×8= = = ÷0.75= ×4÷×4=