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[函数] $x>0,xe^x-\ln x>1.5$

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v6mm131 posted 2016-4-27 23:56 |Read mode
证明:$x>0,xe^x-\ln x>1.5$     ($e^3\approx 20.0855$)

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original poster v6mm131 posted 2016-4-28 06:06
Last edited by v6mm131 2016-4-28 06:12群主牛逼!话说这类题  最近好流行  尝试着编了这么一个题打算考试用  自己给的答案答案的思路入口有点窄 求众神出手!

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色k posted 2016-4-28 08:54
正因為最近連續擼過兩道類似題,所以短期內無興趣再擼

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敬畏数学 posted 2016-4-28 09:49
精度能否再高点。。。。

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游客 posted 2016-4-28 10:52
不等式恒成立,转化为最值问题,极值点不能直接表示时,用其他值放缩。
数据简单就容易观察——一般可考虑2分法,否则就不容易。

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敬畏数学 posted 2016-4-28 12:35
哈哈!整出套路来咯。。。。。

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