因式分解x^2-y^2-2-2y+1-2x

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因式分解x^2-y^2-2-2y+1-2x因式分解x^2-y^2-2-2y+1-2x因式分解x^2-y^2-2-2y+1-2x原式=x^2-2x+1+(-y^2-2y-1)-1=(x-1)^2-(y+

因式分解x^2-y^2-2-2y+1-2x
因式分解x^2-y^2-2-2y+1-2x

因式分解x^2-y^2-2-2y+1-2x
原式=x^2-2x+1+(-y^2-2y-1)-1
=(x-1)^2-(y+1)^2-1
=(x-1-y-1)(x-1+y+1)-1
=(x-y-2)(x+y)-1