Question

[(-20/3)x(12/4)+1/4)-(-2/6-121/11)

Answer 1

Resolvendo por partes:
[(-20/3)x(12/4)+1/4)-(-2/6-121/11) =

-20/3 x 12/4 = (simplifica cruzado) = 5 x 4 = - 20
-2/6 - 121/11 = (simplifica cada uma) -->( - 2/6 = - 1/3) e (-121/11) = -11

Então fica assim:

[(5 x 4) + 1/4] - (-1/3 - 11) =
[ -20 + 1/4 ] - (-34/3) =
-79/4 + 34/3 = ---mmc(3,4) = 12
-237/12 + 136/12 = -101/12