-2xy-x²-y² (x²-2y)²-(1-2y)² 分解因式
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-2xy-x²-y² (x²-2y)²-(1-2y)² 分解因式
![-2xy-x²-y² (x²-2y)²-(1-2y)² 分解因式](/uploads/image/z/19346871-39-1.jpg?t=-2xy-x%26%23178%3B-y%26%23178%3B+%EF%BC%88x%26%23178%3B-2y%EF%BC%89%26%23178%3B-%EF%BC%881-2y%EF%BC%89%26%23178%3B+%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F)
-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+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)
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