如图3-1-1,已知直线l1、l2、l3的斜率分别为k1、k2、k3,则(    ) 图3-1-1A.

如图3-1-1,已知直线l1l2l3的斜率分别为k1、k2、k3,则(    )

图3-1-1

A.k1<k2<k3                                         B.k3<k1<k2

C.k3<k2<k1                                          D.k1<k3<k2

答案

思路解析

:可由直线的倾斜程度,结合倾斜角与斜率的关系求解.

由图可知,直线l1的倾斜角α1为钝角,

所以k1<0;

直线l2、l3的倾斜角均为锐角,且α2>α3,

所以k2>k1>0,

即k1<k3<k2.故选D.

答案

:D

  绿色通道

:直线的斜率由倾斜角唯一确定.

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