-2xy-x²-y² （x²-2y）²-（1-2y）² 分解因式

来源：学生作业学帮网编辑：学帮网时间：2024/05/29 18:28:32

-2xy-x²-y²
=-(x²+2xy+y²)
=-(x+y)²
（x²-2y）²-（1-2y）²
=(x²-2y+1-2y)(x²-2y-1+2y)
=(x²-4y+1)(x²-1)
=(x²-4y+1)(x+1)(x-1)

（x²-2y）²-（1-2y）²
=(x²-2y+1-2y)(x²-2y-1+2y)
=(x²-4y+1)(x²-1)
=(x²-4y+1)(x+1)(x-1)