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Old 12 ¡ØÁÀҾѹ¸ì 2011, 18:12
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¨§ËҼźǡ¢Í§ $ \frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{1000}$ ¨Ð·ÓÍÂèÒ§äôդÃѺªÕéá¹Ð´éǤÃѺ
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #2  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 18:35
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àà¡$21+31+41+...+10001=(20+1)+(30+1)+(40+1)+...+(10000+1)=10(2+3+4+...+1000)+(1+1+..+1) {998µÑÇ}$ ààÅéÇÅͧ·ÓµèÍàͧ¹Ð¤ÃѺ

12 ¡ØÁÀҾѹ¸ì 2011 19:13 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ DEK [T]oR J[O]r [W]aR
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #3  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 18:39
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ÍéÒ§ÍÔ§:
¢éͤÇÒÁà´ÔÁà¢Õ¹â´Â¤Ø³ DEK [T]oR J[O]r [W]aR View Post
àà¡$21+31+41+...+10001=(20+1)+(30+1)+(40+1)+...+(10000+1)=10(2+3+4+...+1000)+(1+1+..+1){998µÑÇ}$ààÅéÇÅͧ·ÓµèÍàͧ¹Ð¤ÃѺ
ÁÒÂѧä§ËÃͤÃѺ ªèÇÂ͸ԺÒÂ˹èͤÃѺ
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  #4  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 18:47
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21+31+...+10001 ÁÒ¨Ò¡ä˹¤ÃѺ
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #5  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 19:16
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¨Ò¡â¨·ÂìÍФÃѺ
»Å.¼Áãªéâ·ÃÈѾ·ìÍФÃѺ
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #6  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 19:18
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#5
ÍèÍ ¼ÁÇèÒàËç¹â¨·Âì¼Ô´ÍèФÃѺ à¾ÃÒÐÁѹà»ç¹àÈÉÊèǹËÁ´àÅ·ÕèàËç¹ 1 ¤×ÍàÈÉ

áÅÐ 1,2,3...,10000 à»ç¹Êèǹ
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  #7  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 19:45
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¢é͹ÕéÁѹà»ç¹ Divergent ¹Õè¤ÃѺ
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  #8  
Old 12 ¡ØÁÀҾѹ¸ì 2011, 19:46
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ÁѹÍÂÙè㹪èǧ$5.988-9.788$
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  #9  
Old 13 ¡ØÁÀҾѹ¸ì 2011, 00:24
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ÅͧËÒÍèÒ¹àÃ×èͧ Harmonic Number ¹Ð¤ÃѺ ÁÕàÃ×èͧ¹èÒʹã¨àÂÍÐàËÁ×͹¡Ñ¹
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  #10  
Old 14 ¡ØÁÀҾѹ¸ì 2011, 22:42
MathTq MathTq äÁèÍÂÙèã¹Ãкº
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ÍÂÒ¡ÃÙçéééàËÁ×͹¡Ñ¹àÍéÒÊÙéæ
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