这能问数学问题马？

来源: brakepad 于 2010-09-02 18:40:17 [] [旧帖] [给我悄悄话] 阅读数 : (193 bytes)
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请指教

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• Please think that only ai is variables others are constant. -jinjing- ♀ 给 jinjing 发送悄悄话 (121 bytes) () 09/03/2010 postreply 13:21:15

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