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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
(-∞,4) (-∞,0) (-4,+∞) (4,+∞)
(x-)2+y2=5 (x+)2+y2=5 (x-5)2+y2=5 (x+5)2+y2=5
x-y-3=0 2x+y-3=0 x+y-1=0 2x-y-5=0
2x-3y-6=0 3x-2y-6=0 3x-2y+6=0 2x-3y+6=0
x+2y-5=0 x+2y+5=0 2x-y=0或x+2y-5=0 2x-y=0或x-2y+3=0
2x+y-12=0 2x+y-12=0或2x-5y=0 x-2y-1=0 x+2y-9=0或2x-5y=0
(x-)2+y2=5 (x+)2+y2=5 (x-5)2+y2=5 (x+5)2+y2=5
2x–y=0 2x–y–2=0 x+2y–3=0 x+2y–5=0
x2+y2+4y-6=0 x2+y2+4x-6=0 x2+y2-2y=0 x2+y2+4y+6=0
(﹣∞,4) (﹣∞,0) (﹣4,+∞) (4,+∞)
x2+y2-4x=0 x2+y2+4x=0 x2+y2-2x-3=0 x2+y2+2x-3=0
y2-4x+4y+8=0 y2+2x-2y+2=0 y2+4x-4y+8=0 y2-2x-y-1=0