Đáp án:
$1/$ `1 + (-9)/16 . 13/27 + 9/16 . (-14)/27`
`= 1 + 9/16 . [-13/27 + (-14/27)]`
`= 1 + 9/16 . (-1)`
`= 1 + (-9)/16`
`= 16/16 + (-9)/16`
`= 7/16`
$2/$ `(-12)/35 : 7/11 - 23/35 : 7/11 - 5/11`
`= (-12)/35 . 11/7 - 23/25 . 11/7 - 5/11`
`= 11/7 . [-12/35 - 23/25] - 5/11`
`= 11/7 . (-7)/5 - 5/11`
`= (-11)/5 - 5/11`
`= (-146)/55`