Giúp gấp ạ cảm ơn nhe ban

`a) (31 6/13 + 5 9/41) - 36 6/13`

`= (31+5-36) + (6/13 - 6/13 + 9/41)`

`= 0 + 9/41`

`= 9/41`.

`b) 5/3 + ( (-2)/7 ) - (-1,2)`

`= 5/3 - 2/7 + 1,2`

`= 29/21 + 1,2`

`= 271/105`.

`c) 0,25 + 3/5 - (1/8 - 2/5 + 1 1/4)`

`= 1/4 + 3/5 - ( (-11)/40 + 5/4 )`

`= 17/20 - 39/40`

`= (-1)/8`.

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