oblicz: [1 1/12- 2 2/3 - (-2 1/2)] : [5/6+ (-1 3/4)]

Odpowiedź:
IV.
[1 1/12- 2 2/3 - (-2 1/2)] : [5/6+ (-1 3/4)] =
= { 13/12-8/3-(-5/2) } : (5/6+(-7/4) } =
= { 13/12-32/12-(-30/12) } : {5/6-7/4} =
= (13/12-32/12+30/12) : (10/12-21/12) =
= 11/12: (-11/12)= 11/12* (-12/11)= -1