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[函数] 坑学生的一个题,模拟考中的,会的不要发过程.

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realnumber Posted 2014-2-25 12:09 |Read mode
若函数$f(x)=x^3-3ax,x\in (-1,1)$的值域为$[m,n]$,则实数a的取值范围是______.
答案$[\frac{1}{4},1)$,过程略~~~.

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Tesla35 Posted 2014-2-25 12:45
开区间闭区间

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 Author| realnumber Posted 2014-2-25 13:07
回复 2# Tesla35
恩,好毒的眼光~~~~

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kuing Posted 2014-2-25 14:00
回复 2# Tesla35

555V5

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isee Posted 2014-2-25 14:24
现在高二及高三正在学习导数,挻好的一题啊。

哪个愿意写过程来看看?

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第一章 Posted 2014-2-26 19:20
坑!
极值也不用这么考吧?

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kuing Posted 2014-2-26 19:44
我也觉得挺好

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其妙 Posted 2014-2-26 20:01
$a=\dfrac14$的时候特喜欢,
好几天没来了

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kuing Posted 2014-2-26 20:02
回复 8# 其妙

三倍角、切比雪夫、……

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其妙 Posted 2014-2-26 20:04
回复 9# kuing

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