Effectuer les opérations suivantes et simplifier les résultats chaque foi que cela est possible A=12/5+8/5 C=25/8-27/24+11/12 B=17/12-4/3 D=5/7-11/28+1 SVP merc

Bonjour,

A=12/5+8/5  

A = 20/5

A = (5 x 4) / (5 x 1)

A = 5

C=25/8-27/24+11/12

C = (25 x 6) / (8 x 6) - (27 x 2) / (24 x 2) + (11 x 4) / (12 x 4)

C = 150/48 - 54/48 + 44/48

C = 194/48 - 54/48

C = 140/48

C = (4 x 35) / (4 x 12)

C = 35/12

B=17/12-4/3

B = 17/12 - (4 x 4) / (3 x 4)

B = 17/12 - 16/12

B = 1/12

D=5/7-11/28+1

D = (5 x 4) / (7 x 4) - 11/28 + (1 x 28) / (1 x 28)

D = 20/28 - 11/128 + 28/28

D = 48/28 - 11/28

D = 37/28