(log2 125+log4 25+log8 5)*(log125 8+log25 4+log5 2)
=(3*log2 5+log2 5+1/3*log2 5)*(log5 2+log5 2+log5 2)
=13/3*log2 5*3*log5 2
=13
(log2 125+log4 25+log8 5)*(log125 8+log25 4+log5 2)
=(3*log2 5+log2 5+1/3*log2 5)*(log5 2+log5 2+log5 2)
=13/3*log2 5*3*log5 2
=13