若abc<0,且y=b/a.x-a/c图像不经过第四象限,则点(a+b,c)在第几象限
人气:410 ℃ 时间:2020-06-13 06:27:49
解答
abc0,且与x轴的交点0,这样有:
b/a>0
-a/c0,ac>0
ab>0,同时 abc
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