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  #1  
Old 24 ¡Ã¡®Ò¤Á 2016, 12:18
Black Joker. Black Joker. äÁèÍÂÙèã¹Ãкº
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Çѹ·ÕèÊÁѤÃÊÁÒªÔ¡: 30 ÁԶعÒ¹ 2014
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Black Joker. is on a distinguished road
Default ͹ءÃÁ ¢é͹Õé¤Ô´Âѧä§
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  #2  
Old 24 ¡Ã¡®Ò¤Á 2016, 17:52
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lek2554 lek2554 äÁèÍÂÙèã¹Ãкº
ÅÁ»ÃÒ³äÃéÊÀÒ¾
  
Çѹ·ÕèÊÁѤÃÊÁÒªÔ¡: 07 ¡Ñ¹ÂÒ¹ 2010
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$S_5=a_1+a_2+a_3+a_4+a_5$
$S_4=a_1+a_2+a_3+a_4$
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #3  
Old 24 ¡Ã¡®Ò¤Á 2016, 18:22
Black Joker. Black Joker. äÁèÍÂÙèã¹Ãкº
àÃÔèÁ½Ö¡ÇÃÂØ·¸ì
  
Çѹ·ÕèÊÁѤÃÊÁÒªÔ¡: 30 ÁԶعÒ¹ 2014
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Black Joker. is on a distinguished road
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¢Í໹ÇÔ¸Õ·Ó˹èͤÃѺ
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #4  
Old 25 ¡Ã¡®Ò¤Á 2016, 13:53
lek2554's Avatar
lek2554 lek2554 äÁèÍÂÙèã¹Ãкº
ÅÁ»ÃÒ³äÃéÊÀÒ¾
  
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$\,S_n\,\,\,\,=a_1+a_2+a_3+...+a_{n-1}+a_n$
$S_{n-1}=a_1+a_2+a_3+...+a_{n-1}$
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
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