z=x^(x^y)Ln z=x^y*Ln x =>Ln(Ln z)=Ln(Ln x)+y*Ln x .(*)(*)两边关于x求偏导：左＝(1/(Ln z))*(1/z)*(dz/dx)右＝(1/Ln x)*(1/x)+y/x整理一下：dz/dx=z*(Ln z)*(1/(x*Ln x)+y/x)=(x^(x^y))*（x^y*Ln x）*(1/(x*Ln x)...