=(333+112/111)÷37×81/56
=37×(9+112/3)÷37×81/56
=(9+112/3)×81/56
=9×81/56+112/3×81/56
=9/56+54/1
=6+9/2+54/1
=6+54/13
=6又54分之13能帮我讲解一下吗？哪里不懂