（x^2-2xy+y^2)+(-2x+2y)+1 分解因式.
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（x^2-2xy+y^2)+(-2x+2y)+1分解因式.（x^2-2xy+y^2)+(-2x+2y)+1分解因式.（x^2-2xy+y^2)+(-2x+2y)+1分解因式.（x^2-2xy+y^2)
（x^2-2xy+y^2)+(-2x+2y)+1 分解因式.
（x^2-2xy+y^2)+(-2x+2y)+1 分解因式.
（x^2-2xy+y^2)+(-2x+2y)+1 分解因式.
（x^2-2xy+y^2)+(-2x+2y)+1
=(x-y)^2-2(x-y)+1
=(x-y-1)^2
x^2-2xy+y^2)+(-2x+2y)+1
=(x-y)^2-2(x-y)+1
=(x-y-1)^2
(x^2-2xy+y^2)+(-2x+2y)+1
=(x-y)^2-2(x-y)+1
=(x-y-1)^2
(x-y-1)^2
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