已知实数x,y满足条件x^2-2xy+2y^2,则|x+y|的最大值为x^2-2xy+2y^2=2

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已知实数x,y满足条件x^2-2xy+2y^2,则|x+y|的最大值为x^2-2xy+2y^2=2
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已知实数x,y满足条件x^2-2xy+2y^2,则|x+y|的最大值为x^2-2xy+2y^2=2
已知实数x,y满足条件x^2-2xy+2y^2,则|x+y|的最大值为
x^2-2xy+2y^2=2

已知实数x,y满足条件x^2-2xy+2y^2,则|x+y|的最大值为x^2-2xy+2y^2=2
缺少条件,x^2-2xy+2y^2=?