Làm hộ mình làm ơn pls

`\text{Đáp án + GIải thích các bước giải:}`

`a) 10 1/5 . ((-7)/5) - 15 1/5 . ((-7)/5) + (-2019)^0`

`= 51/5 . (-7/5) - 76/5 . (-7/5) + 1`

`= (-7/5) . (51/5 - 76/5) + 1`

`= (-7/5) . (-5) + 1`

`= 7 + 1`

`= 8`

`b) (-2 7/12) : 2 1/7 - 1/18 : 2 1/7 + 2 2/9 : 2 1/7`

`= [(-2 7/12) - 1/18 + 2 2/9] : 2 1/7`

`= [(-31/12) - 1/18 + 20/9] : 15/7`

`= (-5/12) : 15/7`

`= -7/36`

`c) 3 1/3 . (-4)/9 + 3 1/3 . 13/9 - 1/3 : 1/4`

`= 10/3 . (-4)/9 + 10/3 . 13/9 - 1/3 . 4`

`= 10/3 . (-4/9 + 13/9) - 1/3 . 4`

`= 10/3 . 1 - 1/3 . 4`

`= 10/3 - 4/3`

`= 2`

`d) (3 - 1/4 + 2/3) - (5 - 1/3 - 6/5) - (6 - 7/4 + 3/2)`

`= 3 - 1/4 + 2/3 - 5 + 1/3 + 6/5 - 6 + 7/4 - 3/2`

`= (3 - 5 - 6) + (-1/4 + 7/4 - 3/2) + (2/3 + 1/3) + 6/5`

`= (-8) + 0 + 1 + 6/5`

`= (-7) + 6/5`

`= -29/5`

`e) (7 - 1/5 + 1/3) - (6 + 9/5 + 4/3)`

`= 7 - 1/5 + 1/3 - 6 - 9/5 - 4/3`

`= (7 - 6) + (-1/5 - 9/5) + (1/3 - 4/3)`

`= 1 + (-2) + (-1)`

`= -2`

`f) 2/3 - 5/3 : 3/4 + 25%`

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

`= 2/3 - 20/9 + 1/4`

`= 24/36 - 80/36 + 9/36`

`= (-47/36)`