Répondre :
9y²-6y+3y = 9y²-3y = 3y(3y-1)
12x²+6x+18 = 6(2x²+x+3)
-2n²-4n-6 = -2(n²+2n+3)
1,7y²-3,4y = 1,7y(y-2)
9(8y-5) = 72y-45
5y(6+4y) = 30y+20y²
9y²-6y+3y = 9y²-3y = 3y(3y-1)
12x²+6x+18 = 6(2x²+x+3)
-2n²-4n-6 = -2(n²+2n+3)
1,7y²-3,4y = 1,7y(y-2)
9(8y-5) = 72y-45
5y(6+4y) = 30y+20y²