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#1
15 µØÅÒ¤Á 2014, 15:54
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#2
15 µØÅÒ¤Á 2014, 20:19
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¡ÃÒ¿¨Ò¡ËÁÒ»èÒ¤ÃѺ
http://www.wolframalpha.com/input/?i...g%28x%5E2-1%29 ÊèǹÇÔ¸Õ¡Òáç¹èÒ¨ÐàÃÔèÁ¨Ò¡¡Ó˹´â´àÁ¹¡è͹ áÅéǤèÍÂæá·¹¤èÒàÍÒ¤ÃѺ
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