已知x^2-2xy+2y^2+6x-6y+9=0求x y
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已知x^2-2xy+2y^2+6x-6y+9=0求x y
已知x^2-2xy+2y^2+6x-6y+9=0求x y
已知x^2-2xy+2y^2+6x-6y+9=0求x y
x^2-2xy+2y^2-6y+9=0
(x²-2xy+y²)+(y²-6y+9)=0
(x-y)²+(y-3)²=0
y-3=0
y=3
x-y=0
x=y=3
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x^2-2xy+2y^2+6x-6y+9=0
(x^2-2xy+y^2)+6x-6y+9+y^2=0
(x-y)^2+6(x-y)+9+y^2=0
(x-y+3)^2+y^2=0
x-y+3=0
y=0
x=3
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