Réponse :

Explications étape par étape :

Bonjour

A = 2/3 + 5/6

A = 4/6 + 5/6

A = 9/6

A= 3/2

B = 7/2 + 21/6

B = 7/2 + (3×7)/(3×2)

B = 7/2 + 7/2

B = 14/2

B = 7

C = 1/12 - 1/3

C = 1/12 - 4/12

C = - 3/12

C = - 1/4

D = 2/11 + 4/9

D = 18/99 + 44/99

D = 62/99