mn giúp e vs ạ.E cảm ơn nhiều

`a)`

`-2/7 . 125/9 : 3/14 : (-5)^2`

`=-2/7 . 125/9 . 14/3 . 1/25`

`=-250/63 . 14/3 . 1/25`

`=-500/27 . 1/25`

`=-20/27`

`b)`

`35/17 + 2/13 - (-11/13 + 1 1/17)`

`=35/17 + 2/13 - (-11/13 + 18/17)`

`=35/17 + 2/13 + 11/13 - 18/17`

`=(35/17 - 18/17) + (2/13 + 11/13)`

`=1 + 1`

`=2`

`c)`

`13/23 . 37/32 - 37/32 . 11/23 + 2/23`

`=37/32 . (13/23 - 11/23) + 2/23`

`= 37/32 . 2/23 + 2/23`

`=37/368 + 2/23`

`=3/16`.