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²log 7 = b
¹⁴log 81 = ²log 81/²log 14
= ²log 3⁴/²log (2.7)
= 4.²log 3/(²log 2 + ²log 7)
= (4/a)/(1+b)
= 4/(a(1+b))
14 log 81 =
14 log 3^4 =
4 . 14 log 3 =
4 . 1 / 3 log 14 =
4 / (3 log 2 + 3 log 7) =
4 / (a + ab)
4 / a (1+b) =