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feixiaolin

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Intergrate[x^(z-1)/(exp(x)+1)]
È¡ t=ln(x), Ôò x=exp(t), dx=exp(t)*dt
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Intergrate[exp(a*t)/(exp(exp(t))+1)]
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http://www.wolframalpha.com/inpu ... 28t%29%29%2B1%29%5D
×îºó£¬È¡x=exp(t), ½«±äÁ¿t»¹Ô­³É±äÁ¿x. zÌæ´úa¼´µÃ¡£

[ Last edited by feixiaolin on 2014-2-16 at 16:14 ]
10Â¥2014-02-16 16:11:52
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feixiaolin

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Intergrate[x^(z-1)/(exp(x)+1),{x}]
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Intergrate[x^(z-1),{x}]/exp(x) + 1      // Intergrate[x^(z-1)]=1/z*x^z

[ Last edited by feixiaolin on 2014-2-14 at 23:36 ]
2Â¥2014-02-14 16:43:13
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nixiaoyong

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ÒýÓûØÌû:
2Â¥: Originally posted by feixiaolin at 2014-02-14 16:43:13
±í´ï²»Ì«Çå³þ£¬ÊÇ
Intergrate
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Intergrate/exp(x) + 1      // Intergrate=1/z*x^z

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3Â¥2014-02-15 09:22:08
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