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, 两点,弦AB的中点为D.(1,0),则直线l的方程为 A. x-y-1=0B.x+y+1=0 x-y+1=0 x+y-1=0
2x+y+2=0 3x-y+3=0 x-y+1=0 x+y+1=0
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
(1-e)x-y+1=0 (1-e)x-y-1=0 (e-1)x-y+1=0 (e-1)x-y-1=0
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
(2,3) (-2,-1) (-4,-3) (0,1)
, 是x轴上的两点,点P.的横坐标为2,且|PA|=|PB|,若直线PA的方程为x-y+1=0,则直线PB的方程是( ) A.2y-x-4=0 B.2x-y-1=0 x+y-5=0 2x+y-7=0
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
(-2,-3) (2,1) (2,3) (-2,-1)