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