4.两条直线A1x+B1y+C1=0.A2x+B2y+C2=0垂直的充要条件是 A.A1A2+B1B2=0 B.A1A2-B1B2=0 C.A1A2/B1B2=-1 D.B1B2/A1A2=1 查看更多

 

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两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是(  )
A、A1A2+B1B2=0
B、A1A2-B1B2=0
C、
A1A2
B1B2
=-1
D、
B1B2
A1A2
=1

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两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是(  )
A.A1A2+B1B2=0B.A1A2-B1B2=0
C.
A1A2
B1B2
=-1
D.
B1B2
A1A2
=1

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两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是( )
A.A1A2+B1B2=0
B.A1A2-B1B2=0
C.
D.

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两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是( )
A.A1A2+B1B2=0
B.A1A2-B1B2=0
C.
D.

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两条直线A1x+B1y+C1=0,A2x+B2y+C2=0垂直的充要条件是( )
A.A1A2+B1B2=0
B.A1A2-B1B2=0
C.
D.

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