Bonjour j'ai besoin de votre aide svp

a. -9/5 + 6/5 = (-9+6)/5 = -3/5

b. 11/9 - 5/9 = (11-5)/9 = 6/9 = 2/3

c. -7/8 + 5/8 = (-7+5)/8 = -2/8 = -1/4

d. 19/20 - 7/20 - (-3)/20
= 19/20 - 7/20 + 3/20
= 15/20
= 3/4