Odpowiedź:
4 i 15/26 * 2 * 13/40 = 119/26 * 2 * 13/40 = 119/13 * 13/40 = 119/40 = 2 i 39/40
6 * 21/24 * 2/7 * 3 = 21/4 * 2/7 * 3 = 3/2 * 3 = 9/2 = 4 i 1/2
1 i 1/5 * 2 * 1/3 * 2 i 1/4 = 6/5 * 2 * 1/3 * 9/4 = 12/5 * 1/3 * 9/4 = 4/5 * 9/4 = 9/5 = 1 i 4/5