2x^2-4xy+4y^2-4x+4=0
(x²-4xy+4y²)+(x²-4x+4)=0
(x-2y)²+(x-2)²=0
x-2=0,x=2
x-2y=0,y=1
(x-y)^2010
=1^2010
=1
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