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Pembahasan= 1/3 log 225 = 1/3 log 152 = 2/3 log 15 = 2/3 (log 3 + log 5 )
log 3 sudah diketahui, sekarang bagaimanan dengan log 5 ? jangan khawatir.
log 5 bisa didapat dari log 10/2 = log 10 – log 2
= 2/3 (log 3 + log 10 – log 2)
= 2/3 . (0.477 + 1 – 0,301)
= 2/3 . 1,176
= 0,784