推出 d=f（X）。f（X）很繁瑣；求導數更繁瑣；導數=0求解為最大時的X值就更更繁瑣。

來源: 皆兄弟也於 2010-10-04 10:47:43 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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