(x+y) (x²-3xy+y²)

来源：学生作业帮助网编辑：作业帮时间：2024/05/08 19:56:13

(x+y) (x²-3xy+y²)
(x+y) (x²-3xy+y²)

(x+y) (x²-3xy+y²)
(x+y) (x²-3xy+y²)=x (x²-3xy+y²)+y (x²-3xy+y²)
=x³-3x²y+xy²+x²y-3xy²+y³
=x³-2x²y-2xy²+y³

原式=x³-3x²y+xy²+x²y-3xy²+y³
=x³-2x²y-2xy²+y³