ac0
所以ab>0
所以a/b>0
-a/b
若ac<0,bc<0,则直线ax+by+c=0不经过哪一象限
若ac<0,bc<0,则直线ax+by+c=0不经过哪一象限
数学人气:182 ℃时间:2020-06-19 13:21:43
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