Đáp án:
`15/37( 38/41-74/45 )-38/41 (15/37+82/76)`
`= 15/37 . 38/41 - 15/37 . 74/45 - 38/41 . 15/37 + (-38/41) . 82/76`
`= (15/37 . 38/41 - 38/41 . 15/37) - 15/37 . 74/45 + (-38/41 . 41/38)`
`= 0 - 15/37 . 74/45 - 1`
`= 0 - 2/3 - 1`
`= -2/3 -1`
`= -2/3 - 3/3`
`= -5/3`