Odpowiedź:
8 i 4/5 + 1 i 1/5 : 3 i 3/5 = 8 i 4/5 + 6/5 : 18/5 = 8 i 4/5 + 6/5 * 5/18 = 8 i 4/5 + 1/3 = 8 i 12/15 + 10/15 = 8 i 22/15 = 9 i 7/15
(5 i 1/8 - 2 i 5/6) * (2/5 + 2/7) = (5 i 3/24 - 2 i 20/24) * (14/35 + 10/35) = (4 i 27/24 - 2 i 20/24) * 24/35 = 2 i 7/24 * 24/35 = 55/24 * 24/35 = 11/7 = 1 i 4/7