bonjour j ai besoin de votre aide pour les exercices 36, 37, et 38 merci

Bonjour,

36)

a. - 5/9 + 4/9 = - 1/9

b. - 5/11 - 8/11 = - 13/11

c. 2/5 - - 7/5 = 2/5 + 7/5 = 9/5

d. - 4/7 - - 5/7 = - 4/7 + 5/7 = 1/7

37)

A = 5/6 + 2/3

A = 5/6 + (2 x 2) / (3 x 2)

A = 5/6 + 4/6

A = 10/6

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

A = 5/3

B = 3/4 + - 3/16

B = (3 x 4) / (4 x 4) - 3/16

B = 12/16 - 3/16

B = 9/16

C = 8/35 + - 4/5

C = 8/35 - (4 x 7) / (5 x 7)

C = 8/35 - 28/35

C = - 20/35

C = (5 x - 4) / (5 x 7)

C = - 4/7

38)

A = 13/25 - 2/5

A = 13/25 - (2 x 5) / (5 x 5)

A = 13/25 - 10/25

A = 3/25

B = - 31/18 - 4/3

B = - 31/18 - (4 x 6) / (3 x 6)

B = - 31/18 - 24/18

B = - 55/18

C = 1 - 5/42

C = (1 x 42) / (1 x 42) - 5/42

C = 42/42 - 5/42

C = 37/42.