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#1
02 àÁÉÒ¹ 2013, 09:55
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#2
09 àÁÉÒ¹ 2013, 19:28
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¼ÁÅͧàÍÒä»à¢éÒ wolfram alpha ààÅéÇÁѹä´é¤èÒàà»Å¡æ ÁͧäÁèÍÍ¡àÅÂÇèҨзÓÂѧ䧴ÕàŤÃѺ¤Ô´ÁÒ¹Ò¹ÅÐ = =
http://www.wolframalpha.com/input/?i...%3D1+to+n%3D45
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