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= ⁵log 15 / ⁵log 35
= ⁵log (3×5) / ⁵log (5×7)
= (⁵log 3 + ⁵log 5) / (⁵log 5 + ⁵log 7)
= (1/m + 1) / (1 + 1/n)
= (1+m)/m / (n+1)/n
= n(1+m) / m(1+n)
∴jawab : D
semoga membantu ^^