Odpowiedź:
1.
5/6 * 9/10 = 1/2 * 3/2 = 3/4
2.
3 3/4 * 1 5/9 = 15/4 * 14/9 = 5 /2 * 7/3 = 35/6 = 5 5/6
3.
4/9 * 1 1/2 = 4/9 * 3/2 = 2/3
4.
2 2/7 * 9/24 = 16/7 * 9/24 = 18/21 = 6/7
5.
1 4/5 * 5/12 = 9/5 * 5/12 = 3/4
6.
7/20 * 10/21 = 1/2 * 1/3 = 1/6
7.
1 1/2 * 1 1/3 = 3/2 * 4/3 = 2
8.
2 2/3 * 1 1/5 = 8/3 * 6/5 = 16/5 = 3 1/5
9.
2 1/6 * 5/13 = 13/6 * 5/13 = 5/6
10.
9/14 * 7/15 = 3/2 * 1/5 = 3/10
11.
1/3 * 2 1/4 = 1/3 * 9/4 = 3/4
12.
3 1/5 * 3/4 = 16/5 * 3/4 = 12/5 = 2 2/5
Szczegółowe wyjaśnienie:
