(x-2y)(x方-2xy+4y方)=?
问题描述:
(x-2y)(x方-2xy+4y方)=?
答
(x-2y)(x方-2xy+4y方)
=x³-2x²y+4xy²-2x²y+4xy²-8y³
=x³-4x²y+8xy²-8y³