L=π(i=1~n)λxi^(λ-1)
l=ln(L)=Σ(i=1~n){lnλ+(λ-1)ln(xi)}
l=nlnλ+(λ-1)Σln(xi)
l'=n/λ+Σln(xi)
设l'=0
n/(^λ)=-Σln(xi)
^λ=-n/(Σln(xi))
L=π(i=1~n)λxi^(λ-1)
l=ln(L)=Σ(i=1~n){lnλ+(λ-1)ln(xi)}
l=nlnλ+(λ-1)Σln(xi)
l'=n/λ+Σln(xi)
设l'=0
n/(^λ)=-Σln(xi)
^λ=-n/(Σln(xi))