Odpowiedź:
3 i 4/5 - 1 i 3/4 = 3 i 16/20 - 1 i 15/20 = 2 i 1/20
1 i 1/4 * 2 i 2/3 = 5/4 * 8/3 = 10/3 = 3 i 1/3
4 i 5/6 + 2 i 1/4 = 4 i 10/12 + 2 i 3/12 = 6 i 13/12 = 7 i 1/12
1 i 1/3 : 3 i 1/5 = 4/3 : 16/5 = 4/3 * 5/16 = 5/12
