为什么函数f（x）=3^√x在x=0有切线却不存在导数?
为什么函数f（x）=3^√x在x=0有切线却不存在导数?
数学人气：519 ℃时间：2019-09-27 20:23:06
优质解答
你问的这个问题挺好的.你需要明白切线的定义,切线是两点无限逼近后的连线,导数必须满足有左导数和右导数,显然f(x)在x=-0出没有导数,因此导数不存在.大概就知道这么多,确切的定义我也比较模糊了.不过大体可以这样理解.
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