Đáp án:
`(-4)/9 . 6/13 + 7 4/9 - 4/9 : 13/7 - 5 4/9 - 2`
`= [(-4)/9 . 6/13 - 4/9 : 13/7] + 7 4/9 - 5 4/9 - 2`
`= [(-4)/9 . 6/13 - 4/9 . 7/13] + 7 4/9 - 5 4/9 - 2`
`= [(-4)/9 . (6/13 - 7/13)] + 7 4/9 - 5 4/9 - 2`
`= [(-4)/9 . (-1)/13] + 7 4/9 - 5 4/9 - 2`
`= 4/117 + (7 4/9 - 5 4/9) - 2`
`= 4/117 + 2 - 2`
`= 4/117 + (2 - 2)`
`= 4/117 + 0`
`= 4/117`