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duandian12: ½ð±Ò+5, ¡ïÓаïÖú 2015-03-27 08:54:28
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duandian12: ½ð±Ò+5, ¡ïÓаïÖú 2015-03-27 08:54:28
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Background is needed to explain since it's not standard. Otherwise treat 1/t as one variable x. That is \partial(ox)/ \partial x=o. Let 1/x=p. Then divide by q. [ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ] |

2Â¥2015-03-25 18:36:37













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