Réponse:
Exercice 3 :
a) 7/2 + 3/10
= 35/10 + 3/10
= 38/10
= 19/5
b) 5/6 - 5/36
= 30/36 - 5/36
= 25/36
c) 3/7 + 6
= 3/7 + 42/7
= 45/7
d) 48/55 - 1/5
= 48/55 - 11/55
= 59/55
e) 9 - 17/20
= 180/20 - 17/20
= 163/20
f) 15/56 + 9/7
= 15/56 + 72/56
= 87/56