`1)` `1/3 * (6/5 - 9/4)`

`= 1/3 * (24/20 - 45/20)`

`= 1/3 * (-21/20)`

`= -7/20`

``

`2)` `-7/5 * (15/14 + 5/7)`

`= -7/5 * (15/14 + 10/14)`

`= -7/5 * 25/14`

`= -5/2`

``

`3)` `1/5 : 3/10 + 5/6`

`= 1/5 * 10/3 + 5/6`

`= 2/3 + 5/6`

`= 4/6 + 5/6`

`= 3/2`

``

`4)` `-4/5 : (20/9 - 8/3)`

`= -4/5 : (20/9 - 24/9)`

`= -4/5 : (-4/9)`

`= -4/5 * (-9/4)`

`= 9/5`

``

`5)` `10/7 : 5/14 - 2/3`

`= 10/7 * 14/5 - 2/3`

`= 4 - 2/3`

`= 12/3 - 2/3`

`= 10/3`

``

`6)` `-3/4 : (1/4 - 5/8)`

`= -3/4 : (2/8 - 5/8)`

`= -3/4 : (-3/8)`

`= -3/4 * (-8/3)`

`= 2`

``

`7)` `5/26 - 5/7 : 2/7`

`= 5/26 - 5/7 * 7/2`

`= 5/26 - 5/2`

`= 5/26 - 65/26`

`= -30/13`

``

`8)` `3/4 : (-3/5) + 1/2`

`= 3/4 * (-5/3) + 1/2`

`= -5/4 + 1/2`

`= -3/4`

``

`9)` `1/3 * (2/15 - 4/9) : 1/9`

`= 1/3 * (6/45 - 20/45) : 1/9`

`= 1/3 * (-14/45) : 1/9`

`= -14/135 : 1/9`

`= -14/135 * 9`

`= -14/15`