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x-2y+z=0 2x-y-z=0 x+2y-z=2 2x+y-z=2
2x+y-z=0 2x-y十z-0 x-y-z=0 2x-y-z=0
x+y-4z+2=0 x-y-4z+2=0 x+y-4z-2=0 x-y-4z-2=0
(x-1)/1=(y-1)/1=(z-1)/-1 (x-1)/1=(y-1)/1=(z-1)/-2 (x-1)/1=(y-1)/-1=(z-1)/-2 x+y-z=1
2x+y-z=0 2x-y十z-0 x-y-z=0 2x-y-z=0
x2+y2=4z x2-y2=2z x2-y2=z x2-y2=4z
(2,0,0) (0,0,-1) (3,-1,0) (0,1,1)
x=y=(3−z)/2 x-1=y-1=(z−1)/2 x-1=(y−1)/−1 =(z−1)/ −2 x-1=y-1=(z−1)/−1
(-1/3,1/9,-1/27),(-1,1,-1) (-1/3,1/9,-1/27),(1,1,1) (1/3,1/9,1/27),(1,1,1) (1/3,1/9,1/27),(-1,1,-1)
2x+y-z=0 2x-y+z=0 x-y-z=0 2x-y-z=0
x+2y+3z+6=0 x+2y+3z-6=0 x-2y+3z+6=0 x-2y+3z-6=0
2x+y-z=0 2x-y+z=0 x-y-z=0 2x-y-z=O
(A) (B) L∥∏. (C) L⊥∏. (D) L与∏斜交.