Question

Me ajudem nessa expressao

[(-1/6)+(1/2-1/3)]-[2/3+(-1/2-5/6)]

Answer 1

tirei mmc de 2 e 3 e mmc de 2 e 6 
 
[ (-1/6) +(3/6 - 2/6)] - [ 2/3 +(- 3/6 - 5/6)]
[ (-1/6) + 1/6 ] -[2/3 - 8/6]
[ -1/6 +1/6 ] - [ 4/6 - 8/6]
      [ 0 ] - [ -4/6 ]
       0 + 4/6
          = 4/6 = 2/3                 ok