bjrs a tous pouvez vous m'aider pour résoudre cet exercice merci

E = 4/6 + 2/30
E = 8/180
E = 4 x 2 / 4 x 45
E = 2/45

F = 7/12 - 3/8
F = 7 x 2 / 12 x 2 - 3 x 3 / 8 x 3
F = 14/24 - 9/24
F = 5/24

G = - 5/7 - 5/9
G = - 5 x 9 / 7 x 9 - 5 x 7 / 9 x 7
G = - 45/63 - 35/63
G = - 80/63

H = 1/3 + 2/5 x 7/6
H = 1/3 + 14/30
H = 1 x 10 / 3 x 10 + 14/30
H = 10/30 + 14/30
H = 24/30
H = 6 x 4 / 6 x 5
H = 4/5