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(x+1)2+y2=2 (x-1)2+y2=2 (x+1)2+y2=4 (x-1)2+y2=4
x2+y2+2x=0 x2+y2+x=0 x2+y2﹣x=0 x2+y2﹣2x=0
(0,1) (0,﹣1) (1,0) (﹣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
x2+y2+2x=0 x2+y2+x=0 x2+y2-x=0 x2+y2-2x=0
x2+y2-4x=0 x2+y2+4x=0 x2+y2-2x-3=0 x2+y2+2x-3=0
(-1,1) (-1,0) (1,-1) (0,-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
( X—30)2+( Y—25) 2=252 ( X+30) 2+(Y+25)2=252 ( X—30)+(Y—25)=25 ( X+30) +(Y+25)=25