mọi ng giúp mình với ạ mình cần gấp

`1)`

`6- (-3/20) + ( -7/5)`

`= 6 + 3/20 - 7/5`

`= 120/20 + 3/20 - 28/20`

`= 95/20`

`= 19/4`

`2)`

`(1/9 - 9/23 ) - ( -14/23 - 1/2 ) + 8/9`

`= 1/9-9/23+14/23 + 1/2 + 8/9`

`= 1/9 + 8/9 - 9/23 + 14/23 + 1/2`

`= 1 + 5/23 + 1/2`

`= 79/46`

`3)`

`1/4 + (-5/3 ) + 2/11 + 8/3 + 3/4`

`= 1/4 - 5/3 + 2/11 + 8/3 + 3/4`

`= 1/4 + 3/4 - 5/3 + 8/3  + 2/11`

`= 1 + 1 + 2/11`

`= 2 + 2/11`

`= 24/11`

`4)`

`15/2 - ( 3/5 + 7/2 ) + (-2/5)`

`= 15/2 - 3/5 - 7/2 - 2/5`

`= 15/2 - 7/2 - 3/5 - 2/5`

`= 4 - 1`

`= 3`

`@Tobi`