而曲線上某點的斜率，隻是其切線的斜率，如果用它來預測曲線的走向，未來的投資，會犯錯的。

來源: 大家幫我買房於 2012-03-23 19:08:35 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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