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[不等式] 请教一个不等式

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Karron_ posted 2013-8-10 18:26 |Read mode
QQ图片20130810181641.jpg

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kuing posted 2013-8-10 18:34
这不显然 $\left(\dfrac x{x+y}\right)^{z+1}<\dfrac x{x+y}$ 么?

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original poster Karron_ posted 2013-8-10 19:42
回复 2# kuing
  啊。傻了。。

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琉璃幻 posted 2013-8-11 21:27
回复 2# kuing


    +1

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其妙 posted 2013-8-17 13:48
类似于那个$\sin^n\alpha+\cos^n\alpha<1(n\geqslant3)$
或者直角三角形的三边$a,b,c$,($c$为斜边),有$a^n+b^n<c^n(n\geqslant3)$

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kuing posted 2013-8-17 14:20
回复 5# 其妙

或者类似于 $\sqrt[x]{a_1^x+a_2^x+\cdots+a_n^x}$ 的单调性

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其妙 posted 2013-8-19 16:51
回复 6# kuing
牛笔!

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