10x²-2xy+y²+6x+1=0
（3x+1）²＋(x-y)²=0
3x+1=0
x-y=0
所以
x=y=-1/3
x+y=-2/3
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
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