Question

x^3-axy^2-2x^2y+8y^3因式分解

Answer 1

x^3-4xy^2-2x^2y+8y^3

=x(x²-4y²)-2y(x²-4y²)

=(x-2y)(x²-4y²)

=(x-2y)(x+2y)(x-2y)

=(x+2y)(x-2y)²