Bonjour j'ai 1 exercice de maths niveau 3eme a faire pour demain svp

Bonjour

A = - 3/5 + 9/20

A = (- 3 x 4) / (5 x 4) + 9/20

A = - 12/20 + 9/20

A = - 3/20

B = 5/12 - 3/8

B = (5 x 2) / (12 x 2) - (3 x 4) / (8 x 4)

B = 10/24 - 12/24

B = - 2/24

B = (2 x - 1) / (2 x 12)

B = - 1/12

C = - 2 - - 4/3

C = (- 2 x 3) / (1 x 3) + 4/3

C = - 6/3 + 4/3

C = - 2/3

D = - 3/10 x - 2/7

D = 6/70

D = (2 x 3) / (2 x 35)

D = 3/35

E = 3/4 x 12/7

E = 36/28

E = (4 x 9) / (4 x 7)

E = 9/7

F = 3 x - 2/- 9

F = 6/9

F = (3 x 3) / (3 x 3)

F = 3/2

G = - 8/9 : 7/4

G = - 8/9 x 4/7

G = - 32/63

H = 11/3 + - 5/4

H = 11/3 x - 4/5

H = - 44/15

I = - 2/3 : - 10/7

I = - 2/3 x - 7/10

I = 14/21

I = (7 x 2) / (7 x 3)

I = 2/3