Réponse :

Bonjour

Explications étape par étape :

Exercice 2

2/3 + 5/12 = 2/3 X 4/4 + 5/12 = 8/12 + 5/12 = 13/12

3/7 + 5/21 = 3/7 X 3/3 + 5/21 = 9/21 + 5/21 = 14/21 pour simplifier tu divises par 7/7 = 2/3

15/8 - 5/4 = 15/8 -5/4 X 2/2 = 15/8 -10/8 = 5/8

23/100 - 3/20 = 23/100 - 3/20 x 5/5 = 23/100 -15/100 = 8/100 = 4/50 = 2/25

19/12 - 3/2 = 19/12 -3/2 X 6/6 = 19/12 -18/12 = 1/12

11/9 - 2/3 = 11/9 -2/3 X 3/3 = 11/9 -6/9 = 5/9

7/5 + 11/10 = 7/5 X 2/2 + 11/10 = 14/10 + 11/10 = 25/10 = 5/2

10/13 - 11/26 = 10/13 X 2/2 -11/26 = 20/26 - 11/26 = 9/26

23/44 - 5/11 = 23/44 -5/11 X 4/4 = 23/44 -20/44 = 3/44