`@``text{Bơ}`

`3.`

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

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

`= 2/3 + 5/6`

`= 4/6 + 5/6`

`= 9/6`

`= 3/2`

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

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

`= 4 - 2/3`

`= 12/3 - 2/3`

`= 10/3`

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

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

`= 5/26 - 5/2`

`= 5/26 - 65/26`

`= -60/26`

`= -30/13`

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

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

`= -5/4 + 1/2`

`= -5/4 + 2/4`

`= -3/4`