log(3)15乘以log(5)15等于多少,..

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log(3)15乘以log(5)15等于多少,..

log(3)15乘以log(5)15等于多少,..
log(3)15乘以log(5)15等于多少
,..

log(3)15乘以log(5)15等于多少,..
log(3)15乘以log(5)15
=log3(3*5)*log5(3*5)
=(log3(3)+log3(5))*(log5(3)+log5(5))
=(1+log3(5))*(log5(3)+1)
=1+log3(5)*log5(3)+log3(5)+log5(3)
=1+(ln3/ln5)*(ln5/ln3)+log3(5)+log5(3)
=2+log3(5)+log5(3)

要用换底公式,即可。