jika 27 log 5 = n, maka 5 log 3 + 243 log akar 5 = ...

27log5 = n
3³log5 = n
³log5 = n/3
5log3 + 243log√5
= 3/n + (3^5log5^½)
= 3/n + (1/10 x n/3)
= 3/n + n/30
= (90 + n²)/30n