Aidez moi svpppp le 41 et 42

bonjour

7/15 + 3/15 = 10/15 = 2/3

5/8 - 1/8 = 4/8 = 1/2

7/9 - 1/9 = 6/9 = 2/3 

2/10 + 3/10 = 5/10 = 1/2

5/6 - 1/6 = 4/6 = 2/3

- 7/12 - 1/12 = - 8/12 = - 2/3

Exercice 41
7/15 + 3/15 = 10/15 = 2/3
5/8 - 1/8 = 4/8 = 2/4 = 1/2
7/9 - 1/9 = 6/9 = 2/3 
Exercixe 42
2/10 + 3/10 = 5/10 = 1/2
5/6 - 1/6 = 4/6 = 2/3
- 7/12 - 1/12 = - 8/12 = - 2/3