Răspuns :

5/6 × 6/5 = 1

12/13 × 13/12 = 1

17/34 × 2 = 1

2/1 × 1/2 = 1

13/12 × 12/13 = 1

12/10 × 5/6 = 1

5/6 × 6/5 = 1

12/13 × 13/12 = 1

17/34 × 34/17 = 1

2/1 × 1/2 = 1

13/12 × 12/13 = 1

12/10 × 10/12 = 1