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³log 2 =1/a
³log 5 =b
^15log 20
=³log 20 / ³log 15
=(³log 2²×5) / (³log 3×5)
=(2 ³log 2 + ³log 5) / (³log 3 + ³log 5)
=(2 . 1/a + b) / (1+b)
=(2/a + b) / (1+b)
=[(2+ab)/a] / (1+b)
=(2+ab) / a(1+b)
=(2+ab) / (a+ab)