已知2x=y,则4x^3-4x^2*y+xy^2=

问题描述:

已知2x=y,则4x^3-4x^2*y+xy^2=
用分组分解法

因为y=2x
则4x³-4x²y+xy²
=4x³-4x²(2x)+x(2x)²
=4x³-8x³+4x³
=0