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#1
23 ÁÕ¹Ò¤Á 2007, 16:38
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͹ءÃÁã¹ÃÙ»¹Õé à»ÅÕè¹à»ç¹ÃÙ»Í×è¹ä´éäËÁ¤ÃѺ
ÃÙ»¹Õé¤ÃѺ ¶éÒà»ç¹ÃÙ»ãËÁè¨Ðà¢Õ¹ÇèÒÍÂèÒ§ääÃѺ
mn-1 + mn-2 + mn-3 + ... + m0 
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#2
23 ÁÕ¹Ò¤Á 2007, 17:00
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$1+m+\dots+m^{n-1}=\dfrac{m^n-1}{m-1}$
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23 ÁÕ¹Ò¤Á 2007 17:01 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ Mastermander
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