(4分之3减5分之3乘6分之5）除于（8分之5加3分之1) 2分之1除于15乘6分之5除4分之3

=(3/4-1/2)÷(7/24)
=1/4×24/7
=7分之6
=1/2×1/15×5/6×4/3
=1/30×5/6×4/3
=1/36×4/3
=27分之1