Odpowiedź:
(2 i 1/4 - 1 i 2/3) : (1/6 + 2/9) - (2 i 3/12 - 1 i 8/12) : (3/18 + 4/18) = (1 i 15/12 - 1 i 8/12) : 7/18 = 7/12 : 7/18 = 7/12 * 18/7 = 9/6 = 1 i 3/6 = 1 i 1/2
