jika diketahui 5 log 3 =a dan 3 log 4 =b maka nilai 12 log 75 ??

3log 75 /3 log 12
= 3 log 3 x 25 / 3 log 4x 3
=( 3 log 3 + 3 log 25)/ (3 log 4 + 3 log 3)
= (1 + 3 logb5^2)/ (b +1)
=(1+ 2 .1/a) /(b+1)
= (a+2)/a(b+1)