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maka
⁴ log 15
= ⁴log 3x5
= ⁴log 3 + ⁴log 5
= 1 / ³log 4 + ⁴log 3 . ³log 5
= 1/b + 1 / ³log 4 . 1/⁵log 3
= 1/b + 1/b . 1/a
= 1/b + 1/ab
= a/ab + 1/ab
= (a+1)/ab
= (1+a) / ab (A)
Jawaban yang benar adalah A. (1+a) / ab
--------
log 4
log(5x3)
= ---------
log4
3 3
log 5 + log3
=-------------------------
3
log 4
1/a + 1
=---------------
b
(1 + a)/a
=---------
b
1+a
=------
ab