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

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【单选题】

若直线ax+by+c=0通过第一、二、三象限，则( )。

ab>0,bc>0

ab>0,bc0 D.ab<0,bc<0

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参考答案：

举一反三

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