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已知直线l1:(a-2)x+3y+a=0与l2:ax+(a-2)y-1=0互相垂直,则a= .
已知直线l1:(a+1)x+y-2=0与直线l2:2ax+(3a+3)y+1=0互相垂直,则实数a=________
已知直线l1:(a-2)x+3y+a=0与l2:ax+(a-2)y-1=0,当l1⊥l2时,
已知直线l1:(k-3)x+(4-k)y+1=0与l2:2(k-3)x-2y+3=0平行,则k的值是 ( )
A.1或3 B.1或5
C.3或5 D.1或2