5.8÷4.9≈ 16.7÷0.31≈
6.85÷2.9≈ 0.45÷1.4≈
(1)18.9÷0.54 (2)50÷3.5
2.7×4.05=
1.332÷0.37=
3.8÷0.42≈(保留到百分位)