①3.09÷0.25×8
②47.6-7.6÷0.2
③11.75÷0.25÷0.4
④3.25÷[(7.6+1.5)÷7]
82.6÷4÷0.25
3.6÷0.4+1.25×5
(3.2+0.16)÷0.8
4.2÷0.25×0.8
(0.09+1.29)÷0.23
50.4÷(5.6×2.5)
93÷0.31÷3