Question 791626
log of 18 to the base 12=a
{{{log(12,18) = a}}}
exponent equiv of logs
{{{12^a = 18}}}
a*log(12) = log(18)
a = {{{log(18)/log(12)}}}
a = 1.16317
and 
log of 54 to the base 24=b
{{{log(24,54) = b}}}
{{{24^b = 54}}}
b*log(24) = log(54)
b = {{{log(54)/log(24)}}}
b = 1.25517
:
then 5(a-b) + ab is?
5(1.16317 - 1.25517) + (1.16317*1.25517) = ?, leave this math for you
see if you get about 1