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