~ Bạn tham khảo ~
`1/2-3/4+5/6-7/12`
`= 6/12 - 9/12 + 10/12 - 7/12`
`= [6 - 9 + 10 - 7]/12`
`= 0/12`
`= 0`
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`(12/35 - 6/7 + 18/14) ÷ 6/[-7] - [-2]/5 - 1`
`= ([-18]/35 + 18/14) * [-7]/6 + 2/5 - 1`
`= 27/35 * [-7]/6 + 2/5 -1`
`= -9/10 + 2/5 - 1`
`= -1/2 - 1`
`= -3/2`