Hej!
1 i 1/3 + (-2,25) = 1 i 1/3 - 2,25 =
= -(2,25 - 1 i 1/3) = -(2 i 1/4 - 1 i 1/3) =
= -(2 i 3/12 - 1 i 4/12) = -11/12
Pozdrawiam! - Julka