Odpowiedź:
20 i 2/3 : 31 = 62/3 * 1/31 = 2/3
10 i 1/5 : 9 = 51/5 * 1/10 = 51/50 = 1 i 1/50
10 i 2/11 : 21 = 112/11 * 1/21 = 112/231
1 i 1/99 : 15 = 100/99 * 1/15 = 20/297
