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(x+1)2+y2=2 (x-1)2+y2=2 (x+1)2+y2=4 (x-1)2+y2=4
(x+1)2+y2=2 (x+1)2+y2=8 (x-1)2+y2=2 (x-1)2+y2=8
3 2 3或﹣5 ﹣3或5
(x+1)2+y2=1 x2+y2=1 x2+(y+1)2=1 x2+(y-1)2=1
(x+1)2+(y-1)2=2 (x-1)2+(y+1)2=2 (x-1)2+(y-1)2=2 (x+1)2+(y+1)2=2
(x+2)2+(y-2)2=1 (x-2)2+(y+2)2=1 (x+2)2+(y+2)2=1 (x-2)2+(y-2)2=1
(x+1)2+(y-1)2=2 (x+1)2+(y+1)2=2 (x-1)2+(y-1)2=2 (x-1)2+(y+1)2=2
y2-4x+4y+8=0 y2+2x-2y+2=0 y2+4x-4y+8=0 y2-2x-y-1=0
y=﹣2x+3 y=x y=3x﹣2 y=2x﹣1
2x-y-1=0 2x+y+1=0 2x-y+1=0 2x+y-1=0
(x+1)2+(y-1)2=2 (x-1)2+(y+1)2=2 (x-1)2+(y-1)2=2 (x+1)2+(y+1)2=2
2x﹣y+8=0 x﹣2y+7=0 x+2y+4=0 x+2y﹣1=0