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数学
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已知直线为ax+by+c=0,如果ac<0且bc>0,则此直线不经过第______象限.
人气:365 ℃ 时间:2020-06-12 00:49:20
解答
当x=0时,y=
−
c
b
,因为bc>0,所以
−
c
b
<0;
当y=0时,x=
−
c
a
∵ac<0∴
−
c
a
>0;
所以直线的大致形状为:
此直线不经过第二象限.
故答案为:二.
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