(x+y)²*(x²-2xy+y²)=( )²

问题描述:

(x+y)²*(x²-2xy+y²)=( )²

填:x³+y³
利用立方和公式得
(x+y)²*(x²-2xy+y²)²
=[(x+y)(x²-2xy+y²)]²
=(x³+y³)²