help me:分解因式：x-y-xx+2xy-yy+2=0

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helpme:分解因式：x-y-xx+2xy-yy+2=0helpme:分解因式：x-y-xx+2xy-yy+2=0helpme:分解因式：x-y-xx+2xy-yy+2=0x-y-x^2+2*x*y

help me:分解因式：x-y-xx+2xy-yy+2=0
help me:分解因式：x-y-xx+2xy-yy+2=0

help me:分解因式：x-y-xx+2xy-yy+2=0
x-y-x^2+2*x*y-y^2+2
=-(x+1-y)*(x-2-y)
=0
x-y+1=0
x-y-2=0

x-y-x²+2xy-y²+2=0
x²-2xy+y²-x+y-2=0
(x-y)²-(x-y)-2=0
(x-y-2)(x-y+1)=0

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