Réponse :
A = x x 3
A = 3x
B = y x 0
B = 0
C = 2 x x x (-4)
C = 2x x (-4)
C = -8x
D = y x (-5) x (-y) x 4
D = -5y x (-y) x 4
D = 5y x 4
D = 20y
E = t x 3 x (t x 4 + 3)
E = 3t x (4t + 3)
E = 12t² + 9t
F = x x (-1) x 4 x x x 0 x (-x)
F = -x x 4 x x x 0 x (-x)
F = -4x x x x 0 x (-x)
F = -4x² x 0 x (-x)
F = 0 x (-x)
F = 0