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²log5 . ⁵log3 = ²log 3 .= ab,
¹⁵log40 = ²log 40 / ²log15 = ²log (8.5)/ ²log( 5.3).
= (²log 8 + ²log5)/(²log5 +²log 3)
= ( 3+ ab)/(b + ab)
.
2) ²log 225 ²log 15² = 2. ²log(5.3)
= 2.(²log5 .+²log 3)
= 2 (p+q)
.
3) ²log3 = p dan ²log5 = q,
9 . ³log5 = 9. ²log5/²log3 = 9 (q/p)