aider moi svp pour cet exercice merci d'avance !!!!!!

bonjour

La prochaine fois, poste à l'endroit STP

1/5 + 2/5 = 3/5
1/5 + 5/12 = 12/60 + 25/60 = 37/60
1/5 - 2 = 1/5 - 10/5 = - 9/5

4/15 + 2/5 = 4/15 + 6/15 = 10/15 = 2/3
4/15 + 5/12 = 16/60 + 25/60 = 41/60
4/15  - 2 = 4/15 - 30/15 = - 26/15

- 6/5 + 2/5 = - 4/5
- 6/5 + 5/12 = - 72/60 + 25/60 = - 47/60
- 6/5 - 2 = - 6/5 - 10/5 = - 16/5