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求导:xxx^x

Easy Differentiate 2

专题
General / 综合
难度
L4

题目详情

How do you differentiate xxx^{x} with respect to xx ?

解析

x>0x>0,令 y=xxy=x^x。取对数得 lny=xlnx\ln y=x\ln x

两边对 xx 求导:

yy=lnx+1.\frac{y'}{y}=\ln x+1.

因此

ddxxx=xx(lnx+1).\boxed{\frac{d}{dx}x^x=x^x(\ln x+1)}.