7.2÷1.6+0.8 18×0.45-3.81
2.5×3.6+42÷28 5.6×1.25-5.58÷3.1
54÷4÷0.25
12.5×8.8
4.8÷( 1.2÷0.5 )
0.58÷0.70.58 9.3÷6.29.3 51.2×0.851.2