4.2÷0.25×0.8
(0.09+1.29)÷0.23
50.4÷(5.6×2.5)
93÷0.31÷3
6.2-=8.32
3.5+0.5=6
2.7×8-5=13
1÷0.25= 0.39÷3= 4.6×5÷4.6×2=
1.25×0.8= 0.46+0.4= 12.8+7.5-12.8+7.5=
0.49÷0.990.49
2.7÷0.012.7×100
5.6÷1.25.6
0÷4.90×4.9
(得数保留两位小数)