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[函数] 函数 请教秒杀的方法

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lrh2006 posted 2014-12-16 13:44 |Read mode
设P(a,b) 是直线y=-x 上的点,若对曲线 y=1/x(x>0)上的任意一点 Q恒有|PQ|>=3, ,则实数a 的取值范围是?     
题目会做,想请教各位高手,有没有秒杀的方法,谢谢!

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kuing posted 2014-12-16 14:19
汗,你之前不是发过一次了吗?
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original poster lrh2006 posted 2014-12-19 13:54
汗,对不起,别骂我,我记性差。对kuing神的钦佩又多了几分。重新看了那几个帖子,温故而知新,有收获,谢谢!

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