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[函数] (转)函数方程

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realnumber posted 2015-1-29 09:57 |Read mode
Last edited by realnumber 2015-1-29 10:09 QQ图片20150129095403.png

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original poster realnumber posted 2015-1-29 10:13
Last edited by realnumber 2015-1-29 10:48令x=y,t=x+f(x)+xf(x)=(x+1)(f(x)+1)-1
则得到f(t)=t.似乎以下子解决上面4个问题.但问题是:怎么说明t可以取任意值?
否则,要另想办法.

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goft posted 2015-1-29 18:58

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其妙 posted 2015-1-29 23:34
回复 3# goft
出处dang!

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