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lrh2006 posted 2020-6-11 20:31 |Read mode
mmexport1591878203387.png
测试一下手机发图,嘻嘻
话说这道题目有没有问题,我觉得如果x1取抛物线顶点位置,是不能满足条件的,请各位指教,谢谢

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色k posted 2020-6-11 21:10
那抛物线的顶点不在左边就没问题了呀

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original poster lrh2006 posted 2020-6-11 21:25
回复 2# 色k


    那怎么做呢,教教我

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色k posted 2020-6-11 21:40
抛物线对称轴不在左边,直线斜率为正,两者在y轴处相连,就ok了吧

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original poster lrh2006 posted 2020-6-11 21:47
回复 4# 色k

嗯嗯,但是对称轴与k无关,所以就不用理他了?

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