#1
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$\frac{9}{10} +\frac{10}{11} +\frac{11}{12} +...+\frac{39}{40}=? $
$1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+\frac{1}{5}-... =? $ ªèÇÂáÊ´§ÇÔ¸Õ·ÓãËé´Ù˹èͤÃѺäÁè·ÃÒºÇèÒà»ç¹Í¹Ø¡ÃÁÎÒÃìÁ͹ԡÃÖà»ÅèÒ
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#2
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¢é͹Õé¼Á fail «ÐáÅéÇ
07 ÁԶعÒ¹ 2010 08:57 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ gnopy |
#3
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ÍéÒ§ÍÔ§:
Âѧãªé¤ÇÒÁÃÙéÁ.»ÅÒÂËҼźǡäÁèä´é áµè¶éÒãªé¤ÇÒÁÃÙéá¤Å¤ÙÅÑÊ ¨Ðä´é $1-\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{4}+\cdots=\ln{2}$ ÁÒ¨Ò¡¡ÒáÃШÒÂ͹ءÃÁà·àÅÍÃì $\ln{(1+x)}=x-\dfrac{x^2}{2}+\dfrac{x^3}{3}-\dfrac{x^4}{4}+\cdots$
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#4
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ªèÇÂáÊ´§ÇÔ¸Õ·Ó¢éÍáá·Õ¤ÃѺ
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