dalam bentuk log berpangkat

2log √27 × 9log 16 +25log 125
= log √27/log 2 × log 16 /log 9 + log 125/log 25
= log (3)^3/2/log 2 × log 2^4/log 3^2 + log 5^3/log 5^2
= 3/2.log 3/log 2 × 4.log 2/2.log 3 + 3.log 5/2.log 5.
= 3/2 × 4/2 + 3/2
= 6/2 + 3/2
= 9/2.