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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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