Nomer 6 saja. Lampiran pertama soal asli. Saya tulis ulang soalnya agar lebih jelas, pada lampiran yang kedua. Makasih gaess.

Bab Logaritma
Matematika SMA Kelas X

6] (²log 10 . ⁵log 10) - (²log 5 + ⁵log 2)
= (log 10/log 2) . (log 10/log 5) - ²log 5 - ⁵log 2
= ((log (5 . 2))/log 2) . ((log (5 . 2))/log 5) - ²log 5 - ⁵log 2 
= ((log 5 + log 2)/log 2) . ((log 5 + log 2)/log 5) - ²log 5 - ⁵log 2
= ((log 5 / log 2) + (log 2 / log 2)) . ((log 5 / log 5) + (log 2 / log 5)) - ²log 5 + ⁵log 2
= (²log 5 + 1) . (1 + ⁵log 2) - ²log 5 - ⁵log 2
= ²log 5 + ²log 5 . ⁵log 2 + 1 + ⁵log 2 - ²log 5 - ⁵log 2
= 1 + 1
= 2

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