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y=x-1 y=-x+1 y=2x-2 y=-2x+2
(-1,-4) (1,0) (-1,0) (1,0)或(-1,-4)
(1,0); (2,8); (1,0)和(-1,-4); (2,8)和(-1,-4)
(0,1) (1,0) (-1,-4)或(1,0) (-1,-4)
y=x-1 y=-x+1 y=2x-2 y=-2x+2
(1,0) (2,8) (1,0)和(-1,-4) (2,8)和(-1,-4)
(1,1) (-1,0) (-1,0)或(1,0) (1,0)或(1,1)
y=x-1 y=-x+1 y=2x-2 y=-2x+2
(1,0)或(-1,-4) (0,1) (-1,0) (1,4)
(1,0) (2,8) (1,0)或(-1,-4) (2,8)或(-1,-4)