Odpowiedź:
2/7 : 5/9 = 2/7 * 9/5 = 18/35
5/7 : 3/8 = 5/7 * 8/3 = 40/21 = 1 i 19/21
4/25 : 2/15 = 4/25 * 15/2 = 6/5 = 1 i 1/5
1 i 1/3 : 7 i 1/5 = 4/3 * 5/36 = 5/27
1/11 : 7/10 = 1/11 * 10/7 = 10/77
1/9 : 5/6 = 1/9 * 6/5 = 2/15
4/7 : 2/21 = 4/7 * 21/2 = 6
2 i 4/7 : 2 i 1/4 = 18/7 : 9/4 = 18/7 * 4/9 = 8/7 = 1 i 1/7
1/9 : 4/5 = 1/9 * 5/4 = 5/36
4/9 : 6/7 = 4/9 * 7/6 = 14/27
