(log以2为底25的对数+log以2为底五分之一的对数)(log以5为底4的对数+log以5为底二分之一的对数)
=[log(2)25+log(2)1/5]*[log(5)4+log(5)1/2]
=log(2)25*(1/5)*log(5)4*1/2
=log(2)5*log(5)2
=(lg5/lg2 )(lg5/lg2)
=1
上式中 log中括号数字是对数的低数.
吉林 汪清LLX
(log以2为底25的对数+log以2为底五分之一的对数)(log以5为底4的对数+log以5为底二分之一的对数)
=[log(2)25+log(2)1/5]*[log(5)4+log(5)1/2]
=log(2)25*(1/5)*log(5)4*1/2
=log(2)5*log(5)2
=(lg5/lg2 )(lg5/lg2)
=1
上式中 log中括号数字是对数的低数.
吉林 汪清LLX