Bonjour,
E = (3/5 - 5/3) / 7/2 - (5 - 2/3)
E = [(3 x 3) / (5 x 3) - (5 x 5) / (3 x 5)] : 7/2 - [(5 x 3) / (1 x 3) - 2/3]
E = (9/15 - 25/15) : 7/2 - (15/3 - 2/3)
E = - 16/15 x 2/7 - 13/3
E = - 32/105 - (13 x 35) / (3 x 35)
E = - 32/105 - 455/105
E = - 487/105.
F = 2/9 - 1/9 * 4/5
F = 2/9 - 4/45
F = (2 x 5) / (9 x 5) - 4/45
F = 10/45 - 4/45
F = 6/45
F = (3 x 2) / (3 x 15)
F = 2/15.
G = (3/5 - 3/25) * 5/4 + 1
G = [(3 x 5) / (5 x 5) - 3/25] x 5/4 + 1
G = (15/25 - 3/25) x 5/4 + 1
G = 12/25 x 5/4 + 1
G = 60/100 + 1
G = (20 x 3) / (20 x 5) + (1 x 5) / (1 x 5)
G = 3/5 + 5/5
G = 8/5.
