#1
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àŢ¡¡ÓÅѧ¤ÃѺ
1^2+2^2+3^2+4^2+5^2+6^2+...+50^2 ä´éà·èÒäËÃè¤ÃѺ
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#2
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Áѹà»ç¹ÊٵäÃѺ
1^2+2^2+3^2+...+n^2=\frac{n(n+1)(2n+1)}{6} à¾ÃÒЩйÑ鹡çá·¹ÊÙµÃàŤÃѺ =\frac{50(50+1)(2(50)+1)}{6} =\frac{50(51)(101)}{6} =42,925
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#3
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#4
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¾ÔÊÙ¨¹ìÊÙµÃÂѧ䧤ÃѺ
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#5
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#6
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¼ÁÃÙéÇèÒÁѹÁÒ¨Ò¡«Ô¡ÁÒ¹èФÃѺ
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¢Í»Åͺ㨵ÑÇàͧ˹è͹ФÃѺ: àÍÒ¹èÒ..¹Õèá¤èʹÒÁà´ÕÂÇ,¶×ÍÇèÒ¿Ò´à¤ÃÒÐËìÅСѹ ʹÒÁ˹éÒµéͧ´Õá¹è[à¤ÃÒÐËìâ´¹¿Ò´ä»à¡ÅÕé§áÅéǹÕè¹Ò] ÊÙéæ |
#7
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¾ÔÊÙ¨¹ìä´éËÅÒÂÇÔ¸Õ¤ÃѺ àªè¹ãªé¡ÒÃÍØ»¹Ñ¸ÃÃÁ´Ò
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#8
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¨§ÇÔè§ãËéÊØ´¡ÓÅѧ áÁéàÃÒÃÙéÇèÒ¨Ðá¾é¡çµÒÁ |
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