tolong bantu ya makasih :)

1. 2 log 25 - 3log 5 + log 20
= 2 log 5^2 - 3 log 5 + log 10.2
= 2. 2 log 5 - 3 log 5 + 1 + log 2 = 1 + 2. 2 log 5 - 3 log 5 + log 2

2. 1/2 2 log 81 - 3. 2 log 3 + 2 log 48
= 1/2 2 log 3^4 - 3. 2 log 3 + 2 log 2.2.2.2.3
= 1/2.4. 2 log 3 - 3. 2 log 3 + 2 log 2 + 2 log 2 + 2 log 2 + 2 log 2 + 2 log 3
= 2. 2 loh 3 - 3. 2 log 3 + 1 + 1 + 1 + 1 + 2 log 3
= 4

Ingat!!! Sifat logaritma

a^m log b^n = n/m a log b
a log b.c = a log b + a log c
a log a = 1
10 log a —> dalam logaritma 10 itu tidak perlu ditulis jadi 10 log a = log a

Maaf yaa kalau salah, semoga membantu ^_^