问题:
两条直线A 1x+B 1y+C 1=0,A 2x+B 2y+C 2=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
两条直线A 1x+B 1y+C 1=0,A 2x+B 2y+C 2=0垂直的充要条件是( )
A.A1A2+B1B2=0 | B.A1A2-B1B2=0 | ||||
C.
|
D.
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参考答案: