d/dx f(x^3)=1/x f(x)导数多少
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d/dx f(x^3)=1/x f(x)导数多少
d/dx f(x^3)=1/x f(x)导数多少
d/dx f(x^3)=1/x f(x)导数多少
两边积分得
f(x^3)=lnx
所以f(x)=ln(x ^1/3)
f′(x)=1/(x ^1/3)*1/3*x^(-2/3)
=x^(-1/3)*1/3*x^(-2/3)
=1/3*x^(-1)
=1/(3x)