August 2018 1 71 Report
Jika 2_{log} 3 = a dan 3_{log} 5 = b maka 15_{log} 20 adalah

a.  \frac{2}{a}
b. \frac{(2+ab)}{a(1 + b}
c.  \frac{a}{2}
d. \frac{(1+b)}{2ab + 1}
e.  \frac{a(1+b)}{2 + ab}
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