Răspuns:
Explicație pas cu pas:
numar 1/7 invers 7
2/3 3/2
5/6 6/5
11/17 17/11
25/37 37/25
1/3 3
0 /
22/7 7/22
21/5 5/21
13/15 15/13
13/4 4/13