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(A) (-2,2,2). (B) (1,-4,2). (C) (2,-2,2). (D) (4,-1,2).
(A) (1,2,2). (B) (2,1,2). (C) (-1,-2,2). (D) (-2,-1,2).
(1,2,-2) (1,2,2) (-1,-2,2) (-1,-2,-2)
x+3y-2z-6=0 x+3y-2z=0 x-3y-2z-6=0 x-3y-2z=0
x-3y-2z=0 x+3y-2z-6=0 x-3y+2z+4=0 x+3y+2z-2=0
(﹣1,2 ) (﹣2,2) (3,﹣1) (3,﹣2)
3x+2y-1=0 3x+2y+7=0 2x-3y+5=0 2x-3y+8=0
[-1,1] [0,1] [-2,2] [0,2]
2x+y+1=0 2x-y-5=0 2x-y-1=0 2x-y+5=0
(-2,2), (4,-2)等距离,则直线l的方程为( ). A.2x+3y-18=0 B.2x-y-2=0 3x-2y+18=0或x+2y+2=0 2x+3y-18=0或2x-y-2=0
3x+2y-7=0 2x+y-4=0 x-2y-3=0 x-2y+3=0
(1.5,4) (1.5,2) (1,2) (2,2)
x-3y-2z=0 x+3y-2z-6=0 x-3y+2z+4=0 x+3y+2z-2=0
x+3y-2z-6=O x+3y-2z=0 x-3y-2z-6=0 x-3y-2z=0