定义好像不需要导数存在
回答: 如果二阶导数存在，二阶导数是零不是充分条件：如 f(x)=x^4；也要看一阶导数是不是递增到递减或递减到递增（定义好像不需要导数
由 youdecide
于 2020-03-31 17:16:11
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