若直线ax+by+c=0经过第一、二、三象限,则( ) A.ab>0,bc>0  

若直线axbyc0经过第一、二、三象限,则(  )

Aab>0bc>0                      Bab>0bc>0

Cab<0bc>0                      Dab<0bc<0

答案

D

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