Odpowiedź:
..... * 4/7 = 9/11
9/11 : 4/7 = 9/11 * 7/4 = 63/44
sprawdzenie 63/44 * 4/7 = 9/11
.... : 6/13 = 4/9
4/9 * 6/13 = 8/39
spr 8/39 : 6/13 = 8/39 * 13/6 = 4/9
.... : 3 i 1/6 = 1 i 2/3
1 i 2/3 * 3 i 1/6 = 5/3 * 19/6 = 95/18
spr 95/18 : 3 i 1/6 = 95/18 * 6/19 = 5/3 = 1 i 2/3
