Đáp án:
`11/125 - 17/18 - 5/7 + 4/9 + 17/4`
`= 11/125 - (17/18 + 5/7 - 4/9 - 17/4)`
`= 11/125 - (238/252 + 180/252 - 112/252 - 1071/252)`
`= 11/125 - ((238 + 180 - 112 - 1071)/252)`
`= 11/125 - (-765/252)`
`= 11/125 - (-85/28)`
`= 11/125 + 85/28`
`= 308/3500 + 10625/3500`
`= 10933/3500`