化简；(x-y)(x+y)+(x-y)²+(x+y)²

来源：学生作业帮助网编辑：作业帮时间：2024/05/03 08:17:53

化简；(x-y)(x+y)+(x-y)²+(x+y)²
化简；(x-y)(x+y)+(x-y)²+(x+y)²

化简；(x-y)(x+y)+(x-y)²+(x+y)²
(x-y)(x+y)+(x-y)²+(x+y)²=x²-y²+x²-2xy+y²+x²+2xy+y²=3x²+y²