BONJOUR Penser à simplifier l'un des termes, puis calculer. A= -20/12-2/3 B= -5/20+7/-4 C= 7/9-56/12 D= -2/9-25/45 merci d'avance

Bonsoir,

A= -20/12-2/3

A = (4 x - 5) / (4 x 3) - 2/3

A = - 5/3 - 2/3

A = - 7/3

B= -5/20+7/-4

B = (5 x - 1) / (5 x 4) - 7/4

B = - 1/4 - 7/4

B = - 8/4

B = (4 x - 2) / (4 x 1)

B = - 2

C= 7/9-56/12

C = 7/9 - (4 x 14) / (4 x 3)

C = 7/9 - 14/3

C = 7/9 - (14 x 3) (3 x 3)

C = 7/9 - 42/9

C = - 35/9

D= -2/9-25/45

D = - 2/9 - (5 x 5) / (5 x 9)

D = - 2/9 - 5/9

C = - 7/9.