Réponse :
S = 4y²-7y-5
T = -2y²+8y+1
U = y²-6y+3
Explications étape par étape :
S = -4y+6-y²-y+5y²-2y-11 T = 3y+5-6y²-4+3y²+12y+y²-7y
S = -y²+5y²-4y-y-2y+6-11 T = -6y²+3y²+y²+3y+12y-7y+5-4
S = (-1+5)y²+(-4-1-2)y+(6-11) T = (-6+3+1)y²+(3+12-7)y+(5-4)
S = 4y²-7y-5 T = -2y²+8y+1
U = 9y²+13-2y²-6y²-10-2y-4y
U = 9y²-2y²-6y²-2y-4y+13-10
U = (9-2-6)y²+(-2-4)y+(13-10)
U = 1y²-6y+3
U = y²-6y+3