Pouvez vous m’aider à faire les calcules ou les cases sont vides svp

Bonjour, 

Trop long, je n'en fais que quelques-uns 


G = - 6/7 + 3
G = - 6/7 + (3 x 7) / (1 x 7)
G = - 6/7 + 21/7
G = 15/7

H =  5 - 14/24
H = (5 x 24) / (1 x 24) - 14/24
H = 120/24 - 14/24
H = 106/24
H = (2 x 53) / (2 x 12)
H = 53/12

J = 19/20 - - 4/30
J = 19/20 + 4/30
J = (19 x 3) / (20 x 3) + (4 x 2) / (30 x 2)
J = 57/60 + 8/60
J = 65/60
J = (5 x 13) / (5 x 12)
J = 13/12

A = 1/ - 2 + 1/5
A = - 1/2 + 1/5
A = (- 1 x 5) / (2 x 5) + (1 x 2) / (5 x 2)
A = - 5/10 + 2/10
A = - 3/10

B = - 1/7 - 3/- 5
B = - 1/7 + 3/5
B = (- 1 x 5) / (7 x 5) + (3 x 7) / (5 x 7)
B = - 5/35 + 21/35
B = 16/35