Bonsoir,
A = x / (x - 2)
x = 0 et x - 2 ≠ 0
x = 0 et x ≠ 2
x.......|.-∞........0............2.........+∞
x.......|..........(-).........O.....(+).......(+)..,..........,
x - 2.|..........(-)................(-).....||.......(+)..........
A......|..........(+)........O....(-).....||.........(+)........
B = (1 - x)/(3x)
1 - x = 0 et 3x ≠ 0
x = 1 et x ≠ 0
x.............|..-∞..........0..........1..........+∞
1-x..........|................(+)...........(+)..O.......(-)............
x............|.................(-)......||....(+)............(+)...........
B...........|..................(-)......||....(+).O........(-)...........
La C je te laisse faire ;)
