Réponse:
Exercice 2 :
A= 8/12 + 5/3
A= 2/3 + 5/3
A= 7/3
B= 40/72 - 1/9
B= 5/9 - 1/9
B= 4/9
C= 15/35 + 2/7
C= 3/7 + 2/7
C= 5/7
D= 5/3 - 52/39
D= 5/3 - 4/3
D= 1/3
Exercice 3 :
A= 13/8 + 5/2 +3/4
A= 13/8 + 20/8 + 6/8
A= 39/8
B= 5/12 + 11/24 + 1/6
B= 10/24 + 11/24 + 4/24
B= 25/24
C= 2 + 3/7 + 11/14
C= 28/14 + 6/14 + 11/14
C= 45/14
D= 3/5 - 4/15 - 7/30
D= 18/30 - 8/30 - 7/30
D= 3/30
D= 1/10
E= 14/9 + 2/3 - 5/18
E= 28/18 + 12/18 - 5/18
E= 35/18
F= 1 - 9/34 + 3/2
F= 34/34 - 9/34 + 51/34
F= 76/34
F= 38/17