西安咸阳机场候机厅:*****A maths promble******数学题*********

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怎样证明“如果x是函数f(x)的拐点，那么f(x)的两界导数等于零”。
（请用证明费尔马的方法证明）
如果你还有更好的，也请SHOW IT OUT!!!!
thank you!!!!!

高数题目自己做

锻炼自己,不懂问同学 .

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