( 1 1/3 - 2 5/6):(0,75- 1 1/6)

To solve this expression, we first need to convert all mixed numbers to improper fractions.

1 1/3 = 4/3 2 5/6 = 17/6 0,75 = 3/4 1 1/6 = 7/6

Now, the expression becomes:

(4/3 - 17/6) / (3/4 - 7/6)

Next, we simplify the fractions:

(8/6 - 17/6) / (9/12 - 7/12) = (-9/6) / (2/12) = -1.5 / 0.1667 = -9

Therefore, the result of the expression is -9.