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#1
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͹ءÃÁ ¢é͹Õé¤Ô´Âѧä§
¢ÍÇÔ¸Õ¤Ô´¢é͹Õé˹èͤèѺ
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#2
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$S_5=a_1+a_2+a_3+a_4+a_5$
$S_4=a_1+a_2+a_3+a_4$ |
#3
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¢Í໹ÇÔ¸Õ·Ó˹èͤÃѺ
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#4
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$\,S_n\,\,\,\,=a_1+a_2+a_3+...+a_{n-1}+a_n$
$S_{n-1}=a_1+a_2+a_3+...+a_{n-1}$ |
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