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x+3y-5=0 x+3y-15=0 x-3y+5=0 x-3y+15=0
过(1,-1,0),方向向量为2i+j-k 过(1,-1,0),方向向量为2i-j+k 过(-1,1,0),方向向量为-2i-j+k 过(-1,1,0),方向向量为2i+j-k
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0
x+y+1=0 x﹣y+1=0 x﹣y﹣1=0 x+y﹣1=0
C.=0, >0B.A.>0,B.>0, =0 C.AB<0,C.=0 AB>0,C.=0
x+y﹣1=0 x﹣y﹣1=0 x+y+1=0 x﹣y+1=0
2x+y-11=0 x+2y-11=0 x+2y=0 2x+y-1=0
(1,1),若l1过原点O.(0,0),则l2与y轴交点的坐标为( ) A.(2,0) (0,2) (0,1) (1,0)
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0
ab>0,bc>0 ab>0,bc<0 ab<0,bc>0 ab<0,bc<0
x﹣y+1=0 x+y﹣1=0 x﹣y﹣1=0 x+y+1=0
x+y-5=0 x+y-3=0 x-y-1=0 x-y+1=0