若2x方+2xy+y^2-2x+1=0,则xy=

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若2x方+2xy+y^2-2x+1=0,则xy=若2x方+2xy+y^2-2x+1=0,则xy=若2x方+2xy+y^2-2x+1=0,则xy=2x方+2xy+y^2-2x+1=0(x+y)²

若2x方+2xy+y^2-2x+1=0,则xy=
若2x方+2xy+y^2-2x+1=0,则xy=

若2x方+2xy+y^2-2x+1=0,则xy=
2x方+2xy+y^2-2x+1=0
(x+y)²+(x-1)²=0
则：
x+y=0
x-1=0
所以：x=1；y=-1
xy=-1

2x^2+2xy+y^2-2x+1
=x^2+2xy+y^2+x^2-2x+1
=(x+y)^2+(x-1)^2
=0 x+y
=0 x-1
=0
x=1 y=-1 xy=-1 XY=-1

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