bonsoir
F = (3 - 2/3) / (4/3 x 7)
F = (9/3 - 2/3) / (28/3)
F = 7/3 x 3/28
F = 7/28 x 3/3
F = 7/(7 * 4)
F = 1/4
G = (2/3) / (5/6) - 2/5
G = 2/3 x 6/5 - 2/5
G = 6/3 x 2/5 - 2/5
G = (2 x 3)/3 x 2/5 - 2/5
G = 2 x 2/5 - 2/5
G = 4/5 - 2/5
G = 2/5
H = (-3/4 + 1/2)/(2/5 - 5/2)
H = (-3/4 + 2/4) / (4/10 - 25/10)
H = (-1/4) / (-21/10)
H = 1/4 x 10/21
H = 10/4 x 1/21
H = (2 x 5)/(2 x 2) x 1/21
H = 5/2 x 1/21
H = 5/42
