1.x^4-4x^3+4x^2-9
2个回答

您好!

1.

x^4-4x^3+4x^2-9

=x^2[x^2-4x+4]-9

=x^2[x-2]^2-9

=[x(x-2)+3][x(x-2)-3]

=[x^2-2x+3][x^2-2x-3]

=[x^2-2x+3][x-3][x+1]

2.

y^5-11y^3+y

=y(y^4-2y^2+1-9y^2)

=y[(y^2-1)^2-9y^2]

=y(y^2+3y-1)

=y^2-3y-1