diketahui ²log 5 = x , ³log 2 = y maka 12log 10 =...

12 log 10 = (2log 10)/(2log 12)

= 2 log (2.5) / 2 log (4.3)

= [ 2log 2 + 2log5] / 2log 4 + 2 log 3

=( 1+x)/(2+1/y)

= (1+x) /[(2y +1)/y]

=y(1+x) / (2y+1)