#1
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͹ءÃÁẺ¹Õé ¨ÐÁÕÇÔ¸Õ¤Ô´ãËéäÇæÂѧ䧤ÃѺ |
#2
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ÍéÒ§ÍÔ§:
$a_n=n^3-n^2$ $a_n=n(n+1)(n+2)-n(n+1)$ |
#3
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ÍéÒ§ÍÔ§:
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à¤Ã×èͧÁ×ͧ͢ËÑÇ¢éÍ | ¤é¹ËÒã¹ËÑÇ¢é͹Õé |
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