已知x^2-2x+y^2+6y+10=0,求分式x-y/x+y的值
3个回答
x^2-2x+y^2+6y+10=0
(x-1)^2+(y+3)^2=0
x=1
y=-3
(x-y)/(x+y)
=4/(-2)
=-2
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