Odpowiedź:
3/5 * 2/7 = 6/35
4/5 * 3/8 = 12/40 = 3/10
3/4 * 8/9 = 24/36 = 4/6 = 2/3
7/15 * 10/21 = 2/9 skracamy 7 i 21 przez 7 a 10 i 15 przez 5
2 i 3/4 * 1/2 = 11/4 * 1/2 = 11/8 = 1 i 3/8
5/9 * 4 i 1/10 = 5/9 * 41/10 = 41/18 = 2 i 5/18
2 i 1/2 * 5 i 1/3 = 5/2 * 16/3 = 80/6 = 13 i 2/6 = 13 i 1/3
3 i 3/4 * 4 i 1/5 = 15/4 * 21/5 = 63/4 = 15 i 3/4 skr 15 i 5 przez 5
5 i 6/7 * 4 i 2/3 = 41/7 * 14/3 = 82/3 = 27 i 1/3 skr 14 i 7 przez 7
