Jika ²log 3 = a dan ³log 5 = b, nilai ¹⁵log 20 = … Tolong ya caranya gimana

¹⁵log 20
=³log20/³log15
=³log4x5/³log3x5
=(³log4+³log5)/(³log3+³log5)
=(2³log2+³log5)/(1+³log5)
=(2(1/a)+b)/(1+b)
=((2/a)+b)/(1+b)
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