已知直線l1:(a+1)x+y-2=0與直線l2:ax+(2a+2)y+1=0互相垂直.則實(shí)數(shù)a的值為 A.-1或2 B.-1或-2 C.1或2 D.1或-2 查看更多

 

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已知直線l1:(a-2)x+3y+a=0與l2:ax+(a-2)y-1=0互相垂直,則a=    .

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已知直線l1:(a+1)x+y-2=0與直線l2:2ax+(3a+3)y+1=0互相垂直,則實(shí)數(shù)a=________

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已知直線l1:(a-2)x+3y+a=0與l2:ax+(a-2)y-1=0,當(dāng)l1l2時(shí),a=________

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已知直線l1:(k-3)x+(4-k)y+1=0與l2:2(k-3)x-2y+3=0平行,則k的值是                                                            (  )

A.1或3                     B.1或5

C.3或5                     D.1或2

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已知直線l1:(k-3)x+(4-k)y+1=0,與l2:2(k-3)x-2y+3=0平行,則k的值是(  )
A.1或3B.1或5
C.3或5D.1或2

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