pouvez vous m’aider à faire l’exercice svp

bonjour

3/4 + 2/6 = 9/12 + 4/12 = 13/12

2/15 + 3/20 = 8/60 + 9/60 = 17/60

5/12 - 9/8 = 10/24 - 27/24 = - 17/24

5/6 - 13/9 = 15/18 - 26/18 = - 11/18

5/12 * 2/15 = 10/180 =  1/18

- 2/9 * 15/8 = - 30/72 = - 5 /12

15/66 - 10/44 = 30/132 - 30/132 = 0

2 + 3/4 =  11/4

7/15 - 1 = 7/15 - 15/15 = - 8/15

5/7 * 3 = 15/7