(以2为底3的对数+以4为底9的对数+以8为底27的对数+以16为底81的对数+以32为底243的对数）-5倍的以2为底二分之三的对数
= lg3/gl2 + 2lg3/(2lg2) +3lg3/(3lg2) + 4lg3/(4lg2) + 5lg3/(5lg2) - 5[lg(3/2)/ lg2]
= lg3/gl2 + lg3/ lg2 + lg3/ lg2 + lg3 / lg2 + lg3/ lg2 - 5lg3/lg2 + 5
= 5