Hasil dari ⁵log3. ⁹log125+ ⁸log2
Jawaban yang benar adalah 1 5/6
Sifat logaritma :
^a log a = 1
^a log b · ^b log c = ^a log c
^(a^m) log (b^n) = (n/m) · ^a log b
Pembahasan :
⁵log3 · ⁹log125+ ⁸log2 = ⁵log3 · ^(3²)log(5³)+ ^(2³)log(2¹)
= ⁵log3 · (3/2) · ³log5 + (1/3) · ²log 2
= (3/2) · ⁵log3 · ³log5 + (1/3) · 1
= (3/2) · ⁵log 5 + (1/3)
= (3/2) · 1 + 1/3
= 3/2 + 1/3
= 9/6 + 2/6
= 11/6
= (6+5)/6
= 6/6 + 5/6
= 1 + 5/6
= 1 5/6
Jadi hasil dari ⁵log3 · ⁹log125+ ⁸log2 = 1 5/6