Question

已知x^2-2xy+2y^2+6x-6y+9=0求x y

Answer 1

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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