Réponse :
a. 4/5 + 11/5 = 15/5 = 3
b. 3/2 + 6/5 = (3*5)/(2*5) + (6*2)/(5*2) = 15/10 + 12/10 = 27/10
c. 7/10 + -11/3 = (7*3)/(10*3) + (-11*10)/(3*10) = 21/30 - 110/30 = -89/30
d. 11/15 - 3/10 = (11*10)/(15*10) - (3*15)/(10*15) = 110/150 - 45/150 = 65/110 = 15/25 = 3/5
Explications étape par étape :
