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2006-07-08 13:38 | |
s87009812 Just can't stay away
µù¥U¤é: 2004-07-25 µoªí¼Æ: 132 ¥x¥_¥«¥ß´º¬ü°ê¤¤
| Re: ¦³¤H·|¥Î²«K¿ìªkºâ¶Ü | | ¤½¦¡ £Un^2= n(n+1)(2n+1)/6
£U20^2= 20(21)(41)/6=2870
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2006-07-08 13:52 | |
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2006-07-08 13:59 | |
linian Home away from home
µù¥U¤é: 2005-11-07 µoªí¼Æ: 292
| Re: ¦³¤H·|¥Î²«K¿ìªkºâ¶Ü | | ³o¬O°ª¤¤±`¥Îªº¹Bºâ²Å¸¹.. _________________ KH~~ ÆùÇUªÅÆòÇKÇQÆö¥@¬ÉÇN ˦Çq•MÆõ³õ©ÒÇV ¤@ºüÇGÇO«HÆþÇMÆêÇeÇ@
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2006-07-08 15:23 | |
aa963854116 Home away from home
µù¥U¤é: 2006-01-06 µoªí¼Æ: 392 ±q¥¼µo²{¤§89¸¹¬P®y
| Re: ¦³¤H·|¥Î²«K¿ìªkºâ¶Ü | | ³o¬O"³s¥[¸¹",§â¨C¤@¶µ¬Û¥[, ¤£¹L³o¼Ë¥´¨Ã¤£§¹¾ã,n¥´ ¤Uk=1¤Wn |
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2006-07-09 13:39 | |
s87009812 Just can't stay away
µù¥U¤é: 2004-07-25 µoªí¼Æ: 132 ¥x¥_¥«¥ß´º¬ü°ê¤¤
| Re: ¦³¤H·|¥Î²«K¿ìªkºâ¶Ü | | ¤Þ¤å:
aa963854116 ¼g¹D: ³o¬O"³s¥[¸¹",§â¨C¤@¶µ¬Û¥[, ¤£¹L³o¼Ë¥´¨Ã¤£§¹¾ã,n¥´ ¤Uk=1¤Wn
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2006-07-09 13:43 | |
ej0cl6 Home away from home
µù¥U¤é: 2005-03-03 µoªí¼Æ: 281 ¡© ² ¡ª ªº ¬G ¶m
| Re: ¦³¤H·|¥Î²«K¿ìªkºâ¶Ü | | §Ú´N¨Ó¸É¥R¤@¤U§a..
³oӲŸ¹ªí¥Ü K=1,2,3,4,.....,n-1,n µM«á¦A§âKªº¨C¤@Ó±a¶i¥hªºÈ¥[°_¨Ó ¤]´N¬O 1^2+2^2+3^2+4^2+...+(n-1)^2+n^2 §Q¥Î¨ä¥L¤è¦¡¥i¥H±À¥X¤½¦¡ ¦A§ân¥Î§Anªº¼Æ¦r±a¤J´N¥i¥H¤F
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2006-07-09 18:28 | |