bonjour pourriez vous m'aider je suis en 4eme ​

Bonsoir

A = 5/9 - 7/4 x 16/42

A = 5/9 - 112/168

A = 5/9 - (56 x 2) / (56 x 3)

A = 5/9 - 2/3

A = 5/9 - (2 x 3) / (3 x 3)

A = 5/9 - 6/9

A = - 1/9

B = 3 - 5/2 : 25/4

B = 3 - 5/2 x 4/25

B = 3 - 20/50

B = (3 x 5) / (1 x 5) - (10 x 2) / (10 x 5)

B = 15/5 - 2/5

B = 13/5

C = (- 1/36 + 1 - 11/6) / (- 1/36 - 1 + 11/6)

C = [- 1/36 + (1 x 36) / (1 x 36) - (11 x 6) / (6 x 6)] / [- 1/36 - (1 x 36) / (1 x 36) + (11 x 6) / (6 x 6)

C = (- 1/36 + 36/36 - 66/36) / (- 1/36 - 36/36 + 66/36)

C = - 28/36 : 29/36

C = - 28/36 x 36/29

C = - 1 008/1 044

C = (36 x - 28) / (36 x 29)

C = - 28/29

D = 13/8 - (3/4 - 3/32) x 3

D = 13/8 - [[3 x 8) / (4 x 8) - 3/32] x 3

D = 13/8 - (24/32 - 3/32) x 3

D = 13/8 - 21/32 x 3

D = (13 x 4) / (8 x 4) - 63/32

D = 52/32 - 63/32

D = - 11/32.