calculer et donner le résultat sous la forme d'une fraction irréductible. svp aider moi , merci d'avance. ​

Réponse:

Bonsoir déjà.

A = (2/3) + (7/3) x (-4/9)

A = (2/3) + (-28/27)

A = (18/27) - (28/27)

A = -10/27

B = (2 - (5/8)) / (3/4)

B = (16/8 - 5/8) / (3/4)

B = (11/8) / (3/4)

B = 11/8 * 4/3

B = 44/24

B = 22/12

B = 11/6

C = ((4/5) - 2) * ((3/4) - (2/3))

C = ((4/5) - (10/5)) * ((9/12) - (8/12))

C = -6/5 * 1/12

C = -6/60

C = -1/10

D = 2/13 - 5/13 / 10/16

D = 2/13 - ((5/13) * (10/16))

D = 2/13 - 50/208

D = 32/208 - 50/208

D = -18/208

D = -9/104