Réponse:
M = x(3x + 1)
N = 2t( 4t + 1
P = - x ( 1 + (-3x))
Q = 3y^² ( 1 + 3y)
R = 4 ( x^² + x + 1)
S= 5 ( -x^² + 2x + 3)
T = 3 ( 3y^² - y + 9)
U = y^² ( 3y + 1)
