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已知x2+y2-2x+6y+10=0,则x+y的值为?
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已知x2+y2-2x+6y+10=0,则x+y的值为?
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答案和解析
即(x²-2x+1)+(y²+6u+9)=0
(x-1)²+(y+3)²=0
所以x-1=y+3=0
x=1,y=-3
所以x+y=-2
(x-1)²+(y+3)²=0
所以x-1=y+3=0
x=1,y=-3
所以x+y=-2
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