Odpowiedź:
8 i 4/11 - 5 i 9/11 = 7 i 15/11 - 5 i 9/11 = 2 i 6/11
8 i 5/6 + 5 i 3/8 = 8 i 20/24 + 5 i 9/24 = 13 i 29/24 = 14 i 5/24
7 i 2/3 - 4 i 2/5 = 7 i 10/15 - 4 i 6/15 = 3 i 4/15
1 i 2/7 * 4 i 1/12 = 9/7 * 49/12 = 21/4 = 5 i 1/4
4 i 8/15 : 3 i 2/5 = 68/15 : 17/5 = 68/15 * 5/17 = 4/3 = 1 i 1/3
