Svp c pour l’exercice 1 je suis en 3ème

Bonjour

A = - 13/8 + 7/16

A = (- 13 x 2) / (8 x 2) + 7/16

A = - 26/16 + 7/16

A = - 19/16

B = 7/35 + 8/15

B = (7 x 3) / (35 x 3) + (8 x 7) / (15 x 7)

B = 21/105 + 56/105

B = 77/105

B = (7 x 11) / (7 x 15)

B = 11/15

C = 11/26 - 5/39

C = (11 x 3) / (26 x 3) - (5 x 2) / (39 x 2)

C = 33/78 - 10/78

C = 23/78

D = 7/11 + 4/25

D = (7 x 25) / (11 x 25)  + (4 x 11) / (25 x 11)

D = 175/275 + 44/275

D = 219/275

E = 3/12 - 5/18 + 1

E = (3 x 3) / (12 x 3) - (5 x 2) / (18 x 2) + (1 x 36) / (1 x 36)

E = 9/36 - 10/36 + 36/36

E = 35/36

F = - 5/4 + 2/3 - - 7/5

F = (- 5 x 15) / (4 x 15) + (2 x 20) / (3 x 20) + (7 x 12) / (5 x 12)

F = - 75/60 + 40/60 + 84/60

F = 49/60.