log(a^n)(M)=1/nlog(a)(M)..
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log(a^n)(M)=1/nlog(a)(M)..
log(a^n)(M)=1/nlog(a)(M)..
log(a^n)(M)=1/nlog(a)(M)..
采用换底公式(均换为以a为底):log(a^n)(M)=log(a)(M)/log(a)(a^n)=(1/n)log(a)(M)
log(a^n)(M)=1/nlog(a)(M)..
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