2 câu trả lời
`(-13)/17+(2/3+3/17)`
`= (-13)/17+2/3+3/17`
`= [(-13)/17+3/17]+2/3`
`= (-10)/17+2/3`
`= (-30)/51+34/51`
`= 4/51`
`#Jo`
`-13/17` `+` `(` `2/3` `+` `3/17` `)`
`=` `-13/17` `+` `2/3` `+` `3/17`
`=` `(` `-13/17` `+` `3/17``)` `+` `2/3`
`=` `-10/17` `+` `2/3`
`=` `-30/51` `+` `34/51`
`=` `4/51`