Réponse:
2x+x²
=2×x+x×x
=x×(2+x)
y²-7y
=y×y-7×y
=y×(y-7)
xy-x
=x×y-x
=x×(y-1)
2n-3nm
=2×n-3×n×m
n×(2-3m)
tien tout tes bon
