Question

Answer 1

r: =-42/12+9/12-17/12=-50/12=-25/6

s: =-1/12-21/8+1/3

=-2/24-63/24+8/24

=-57/24=-19/8

Answer 2

`(-3)/26 + 2 4/69`

`=(-3)/26 + 142/69`

`=` Xem lại đề ko tính ra phân số đc nhé

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`-7/2 + 3/4 - 17/12`

`=-42/12 +9/12 - 17/12`

`=(-42+9-17)/12`

`=-50/12`

`=-25/6`

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`(-1)/12 - (2 5/8 - 1/3)`

`=(-1)/12 - 2 5/8 + 1/3`

`=(-1)/12 - 21/8 + 1/3`

`= (-2)/24 - 63/24 + 8/24`

`=(-2-63+8)/24`

`=-57/24`

`=-19/8`