x²＋y²－6x＋2y＋9+1＝0(x-3)²＋(y+1)²＝0则 x=3 y=-1x－y²=3-(-1)²=2
x²＋y²－6x＋2y＋10＝0,x²－6x＋9+y²＋2y＋1＝0,(x-3)^2+(y+1)^2=0x=3,y=-1代入，3-1=2~~~~~~~~~~求采纳~~~~~~~~·
