Réponse:

37)

a. 8/15 + 13/15 = 21/15 = 7/5

b. 19/14 - 9/14 = 10/14 = 5/7

c. 15/22 + 3/22 = 18/22 = 9/11

d. 3/12 + 4/12 = 7/12

38.)

a. faux

b. vrai

c. vrai

d. faux