Pouvez-vous m'aider pour less exercices 3 et 4?Merci!

Exercice 3

G = 3/2 -1/5 X 25/7

G = 15/10 -2/10 X 25/7

G = 13/10 X 25/7

G = 325/70 = 65/14

H = (2/8 -3/15) +3/10

H = (30/120 -24/120) + 3/10

H = 6/120 + 3/10

H = 6/120 + 36/120

H = 42/120 = 7/20

I = 5/4 +2/5 = 25/20 + 8/20 = 33/20 = 33/20 X 5/3 = 165/60 = 33/12

     2-7/5            10/5 -7/5          3/5