定義好像不需要導數存在
回答: 如果二階導數存在，二階導數是零不是充分條件：如 f(x)=x^4；也要看一階導數是不是遞增到遞減或遞減到遞增（定義好像不需要導數
由 youdecide
於 2020-03-31 17:16:11
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