#1
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͹ءÃÁàâҤ³Ôµ
3+9+27+...+a15
¨Ðä´é r=3 ¨Ò¡Êٵà Sn=a1(rn-1)/(r-1) =3(315-1)/(3-1) =...ªèǤԴµèÍ·Õ¤ÃѺẺÊÑé¹æ(ᡵÑÇ»ÃСͺÍÐäþǡ¹ÕéÍèФÃѺ) |
#2
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¡çä´é¤ÓµÍºáÅéǹÕè¤ÃѺ ¶éÒµéͧ¡ÒÃà»ç¹¨Ó¹Ç¹àµçÁ¡ç¨Ðä´é
= 3(14,348,907 - 1)/2 = 21,523,359 |
#3
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315 - 1 =
(3-1)(314+313+....+1 ÍéÒÇ¡ÅѺä»â¨·Âì¹Õè¹èÒ §èÒ¢Öé¹à»ÅèÒ¹Õè |
#4
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µéͧ¡ÒÃÇÔ¸Õ¤Ô´·Õè·ÓãËéµÑÇàÅ¢¹éÍÂŧÊÒÁÒö¤Ô´ä´é§èÒ¡ÇèÒ¹ÕéÁÕäËÁ¤ÃѺ
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#5
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¤§äÁèÁÕáÅéǤÃѺ
ÍÂèÒ§´Õ·ÕèÊØ´¡çá»Å§ 315à»ç¹ 2433 à·èÒ¹Ñé¹
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