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a.

`5/16-5/24`

`=15/48-10/48`

`=5/48`

b.

`2/11+(-5/11-9/11)`

`=2/11-5/11-9/11`

`={2-5-9}/11`

`=-12/11`

c.

`1/10-(5/12-1/15)`

`=1/10-7/20`

`=2/20-7/20`

`=-5/20`

`=-1/4`