Ai giải giúp mik vs ạ , cảm ơn mn

Answer

`a, {-3}/13 + 7/12 - 10/13 + 5/12`

`= ({-3}/13 - 10/13) + (7/12 + 5/12)`

`= {-13}/13 + 12/12`

`= -1 + 1`

`= 0`

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`b, 15/24 - 6/26 + 28/48 - 30/39 + 10/24`

`= 5/8 - 3/13 + 7/12 - 10/13 + 5/12`

`= 5/8 - (3/13 + 10/13) + (7/12 + 5/12)`

`= 5/8 - 13/13 + 12/12`

`= 5/8 - 1 + 1`

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

`= 5/8 + 0`

`= 5/8`

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`c, {-1}/2 + 3/7 - 1/9 - 7/18 + 4/7`

`= ({-1}/2 - 1/9 - 7/18) + (3/7 + 4/7)`

`= ({-11}/18 - 7/18) + 7/7`

`= {-18}/18 + 1`

`= -1 + 1`

` = 0`

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`d, {-5}/10 + 12/28 - 3/27 - 7/18 + 20/35`

`= {-1}/2 + 3/7 - 1/9 - 7/18 + 4/7`

`= ({-1}/2 - 1/9 - 7/18) + (3/7 + 4/7)`

`= ({-11}/18 - 7/18) + 7/7`

`= {-18}/18 + 1`

`= -1 + 1`

` = 0`