Aider moi svp c pour demain L’ex 1 Merci

Bonsoir

A = 1/2 + 2/3

A = (1 x 3) / (2 x 3) + (2 x 2) / (3 x 2)

A = 3/6 + 4/6

A = 7/6

B = 3/5 - 2/7

B = (3 x 7) / (5 x 7) - (2 x 5) / (7 x 5)

B = 21/35 - 10/35

B = 11/35

C = 1/- 2 - - 5/3

C = - 1/2 + 5/3

C = (- 1 x 3) / (2 x 3) + (5 x 2) / (3 x 2)

C = -3/6 + 10/6

C = 7/6

D = - 4/3 - 1/- 6 + - 7/- 12

D = (- 4 x 4) / (3 x 4) + (2 x 2) / (6 x 2) + 7/12

D = - 16/12 + 4/12 + 7/12

D = - 5/12.