Question

求导 ln(x/5)ln(5/x)1/5[ln(2x)]

Answer 1

[ln(x/5)]'=(lnx/5)'(x/5)'=(5/x)(1/5)=1/x

[ln(5/x)]'=ln(5/x)'(5/x)'=-1/x

(1/5)[ln(2x)]'=(1/5)(1/2x)*(2x)'=1/(5x)