Odpowiedź:
5 i 3/8 - 3 i 5/6 = 5 i 9/24 - 3 i 20/24 = 4 i 33/24 - 3 i 20/24 = 1 i 13/24
3 i 2/3 + 4/7 + 2/9 + 1/3 = 3 i 42/63 + 36/63 + 14/63 + 21/63 = 3 i 113/63 = 4 i 50/63
145 i 3/10 - 142 i 7/15 = 145 i 9/30 - 142 i 14/30 = 144 i 39/30 - 142 i 14/30 = 2 i 25/30 = 2 i 5/6
2 i 2/7 * 2 i 5/8 = 16/7 * 21/8 = 6 skracamy 16 i 8 przez 8 a 21 i 7 przez 7