X2+y2+2x-6y+10=0 则x-y=
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X2+y2+2x-6y+10=0则x-y=X2+y2+2x-6y+10=0则x-y=X2+y2+2x-6y+10=0则x-y=x^2+y^2+2x-6y+10=x^2+2x+1+y^2-6x+9=(x
X2+y2+2x-6y+10=0 则x-y=
X2+y2+2x-6y+10=0 则x-y=
X2+y2+2x-6y+10=0 则x-y=
x^2+y^2+2x-6y+10=x^2+2x+1+y^2-6x+9=(x+1)^2+(y-3)^2=0
因为：（x+1）^2>=0 （y-3）^2=0
所以：x=-1 y=3
x-y=-1-3=-4.
X^2+y^2+2x-6y+10=0
X^2+2x+1+y^2-6y+9=0
(X+1)^2+(y-3)^2=0
x=-1,y=3
x-y=-1-3=-4