Odpowiedź:
6 i 4/5 - 1 i 1/6 * 5,4 = 6 i 4/5 - 7/6 * 54/10 = 6 i 4/5 - 63/10 = 6 i 4/5 - 6 i 3/10 = 6 i 8/10 - 6 i 3/10 = 5/10 = 1/2