Odpowiedź:
2/5 : 6/15 = 2/5 * 15/6 = 3/3 = 1
1 i 3/10 : 1 i 1/2 = 13/10 * 2/3 = 13/15
2/7 : 4/9 = 2/7 * 9/4 = 9/14
1 i 2/3 : 2 i 1/6 = 5/3 : 13/6 = 5/3 * 6/13 = 10/13
6 i 2/3 : 2 i 1/2 = 20/3 : 5/2 = 20/3 * 2/5 = 8/3 = 2 i 2/3
