calculer merci de m'aider

Exo 5
g = 4/8 + 6/8 - 5/8 = 10/8 - 5/8 = 5/8
h = 3/10 - 5/10 - 6/5 =3/10 - 11/10 = - 8/10 = -4/5
i = 27/36 - 8/36 -5/6 =19/36 - 30/36 = -11/36

Exo 6
f) x = 55
g) x = -427
e) x = 405
c) x = 5
b) x = 55,5
d) x = 3
a) x = 0,2
h) x = 3
i)  x = 756,25