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y=3x2或y=-3x2 y=3x2 y2=-9x或y=3x2 y=-3x2或y2=9x
x+y+1=0 x+y-1=0 x-y+1=0 x-y-1=0
x+y+1=0 x+y-1=0 x-y+1=0 x-y-1=0
x+y+1=0 x+y*1=0 x-y+1=0 x-y-1=0
x2+y2+4y-6=0 x2+y2+4x-6=0 x2+y2-2y=0 x2+y2+4y+6=0
2x-y-1=0 2x+y+1=0 2x-y+1=0 2x+y-1=0
x+y+1=0 x-y-1=0 x+y-1=0 x-y+1=0