实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.
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实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的
实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.
实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.
实数x、y满足2x^2-2xy+y^2+2x+1=0,求x-y的值.
(x-y)^2+(x+1)^2=0
x=y
x=-1
x-y=-1+1=0