Bonsoir , pourriez-vous m’aider pour la 2)

Bonjour

C = 7/5 - 4/5 x 25/8

C = 7/5 - 100/40

C = (7 x 8) / (5 x 8) - 100/40

C = 56/40 - 100/40

C = - 44/40

C = (4 x - 11) / (4 x 10)

C = - 11/10

D = 7/8 + 11/24 - 4/7

D = (7 x 21) / (8 x 21) + (11 x 7) / (24 x 7) - (4 x 24) / (7 x 24)

D = 147/168 + 77/168 - 96/168

D = 128/168

D = (8 x 16) / (8 x 21)

D = 16/21

E = 25/13 : 15/21 - 7/3

E = 25/13 x 21/15 - 7/3

E = 525/195 - 7/3

E = 525/195 - (7 x 65) / (3 x 65)

E = 525/195 - 455/195

E = 70/195

E = (5 x 14) / (5 x 39)

E = 14/39.