log(a^n)M=1/nlog(a)(M) 怎么证明?
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log(a^n)M=1/nlog(a)(M)怎么证明?log(a^n)M=1/nlog(a)(M)怎么证明?log(a^n)M=1/nlog(a)(M)怎么证明?用换底公式证明.证:设c>0,且c≠1
log(a^n)M=1/nlog(a)(M) 怎么证明?
log(a^n)M=1/nlog(a)(M) 怎么证明?
log(a^n)M=1/nlog(a)(M) 怎么证明?
用换底公式证明.
证:设c>0,且c≠1,则:
log(a^n)M=log(c)M /log(c)(a^n)=log(c)M /[n*log(c)a]=1/n*[log(c)M/log(c)a]=1/nlog(a)M
所以命题得证.
设左式等于数k,则
(a^n)^k=M,
a^(nk)=M.
则有nk=log(a)(M)
k=1/nlog(a)(M)
即左式=右式
log(a^n)(M)=1/nlog(a)(M)..
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