peut tu m'aider merci d'avance ​

Bonjour,

A = - 2/9 + 5/18

A = (- 2 x 2) / (9 x 2) + 5/18

A = - 4/18 + 5/18

A = 1/18

B = 6 - 7/6

B = (6 x 6) / (1 x 6) - 7/6

B = 36/6 - 7/6

B = 29/6

C = - 2/15 - 1/- 60 + 5/30

C = (- 2 x 4) / (15 x 4) + 1/60 + (5 x 2) / (30 x 2)

C = 8/60 + 1/60 + 10/60

C = 19/60

D = (3/2 + - 7/4) - (2/3 + - 1/3)

D = [(3 x 2) / (2 x 2) - 7/4] - 1/3

D = (6/4 - 7/4) - 1/3

D = - 1/4 - 1/3

D = (- 1 x 3) / (4 x 3) - (1 x 4) / (3 x 4)

D = - 3/12 - 4/12

D = - 7/12.