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= log ( 2 pangkat 5)
= 5 x log 2
= 5 x ( 0,301)
= 1,505
2. log 75
= log ( 25 x 3)
= log ( 5² x 3)
= ( 2 x log 5) + log 3
= ( 2 x 0,699) + 0,477
= 1,398 + 0,477
= 1,875