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2Â¥: Originally posted by feixiaolin at 2013-12-26 18:24:07
Âú×ãt¡ú¡Þ,f(t)*exp(-t)¡ú0µÄf(t)£¬¾ù¿É¡£

Ã²ËÆf(t)=tʱ£¬Õâ¸ö²»¶¨»ý·Ö¾Í»ý²»³öÀ´
3Â¥2013-12-26 22:19:41
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[ Last edited by feixiaolin on 2013-12-26 at 23:08 ]
2Â¥2013-12-26 18:24:07
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feixiaolin

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3Â¥: Originally posted by ×·ÇóÃÔã at 2013-12-26 22:19:41
Ã²ËÆf(t)=tʱ£¬Õâ¸ö²»¶¨»ý·Ö¾Í»ý²»³öÀ´...

Integrate[t*exp(-t) ]= - exp(-t)*(t+1)
4Â¥2013-12-26 22:48:13
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4Â¥: Originally posted by feixiaolin at 2013-12-26 22:48:13
Integrate= - exp(-t)*(t+1)...

Ç×£¬ÎÒÊÇ˵¡Òt*exp(-t^2)sintdtÕâ¸öº¯Êý»ý²»³öÀ´

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