Bonsoir,
Calculer :
E = -4/9 x 8
E = - 32/9
F = 8/9 x -2 x 3
F = - 16/9 x 3
F = - 48/9
F = (3 x - 16) / (3 x 3)
F = - 16/3
G = -15/16 x 12/35
G = - 180/560
G = (20 x - 9) / (20 x 28)
G = - 9/28
H = -4/21 x 9/-12 x 28/27
H = 36/252 x 28/27
H = 1 008/6 804
H = (252 x 4) / (252 x 27)
H = 4/27.