Odpowiedź:
1 i 3/5 * 4/9 = 8/5 * 4/9 = 32/45
4/7 * 1 i 2/3 = 4/7 * 5/3 = 20/21
3/5 * 1 i 4/7 = 3/5 * 11/7 = 33/35
4 i 1/3 * 2/9 = 13/3 * 2/9 = 26/27
1 i 3/10 * 5/7 = 13/10 * 5/7 = 13/14 skracamy 5 i 10 przez 5
4/5 * 1 i 1/8 = 4/5 * 9/8 = 9/10 skracamy 4 i 8 przez 4
5/12 * 1 i 5/13 = 5/12 * 18/13 = 15/26 skr 18 i 12 przez 6
5/16 * 2 i 2/11 = 5/16 * 24/11 = 15/22 skr 24 i 16 przez8
