把x( 3)-4xy( 2)-2x( 2)y+8y( 3)因式分解,写出具体过程.
问题描述:
把x( 3)-4xy( 2)-2x( 2)y+8y( 3)因式分解,写出具体过程.
答
x^3-4xy^2-2x^2y+8y^3
=x(x^2-4y^2)-2y(x^2-4y^2)
=(x-2y)(x^2-4y^2)
=(x-2y)(x+2y)(x-2y)
=(x+2y)(x-2y)^2