Odpowiedź:
3 i 1/9 * 4 i 2/3 + 1 i 3/7 = 28/9 * 14/3 + 1 i 3/7 = 392/27 + 1 i 3/7 = 14 i 14/27 + 1 i 3/7 = 14 i 98/189 + 1 i 81/189 = 15 i 179/189
8 i 1/2 - 1 i 2/3 * 2 i 2/5 = 8 i 1/2 - 5/3 * 12/5 = 8 i 1/2 - 4 = 4 i 1/2
1 i 5/7 * (4 i 1/3 - 2 i 5/6) = 1 i 5/7 * (4 i 2/6 - 2 i 5/6) = 1 i 5/7 * (3 i 8/6 - 2 i 5/6) = 1 i 5/7 * 1 i 3/6 = 12/7 * 9/6 = 18/7 = 2 i 4/7
