(x-2y)(x方-2xy+4y方)=?

问题描述:

(x-2y)(x方-2xy+4y方)=?

(x-2y)(x方-2xy+4y方)
=x³-2x²y+4xy²-2x²y+4xy²-8y³
=x³-4x²y+8xy²-8y³