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3 3/8 = 27/8
Aplicando la definición: (27/8)^x = 4/9
Aplicamos ahora logaritmo de base conocida:
x . log(27/8) = log(4/9)
x = log(4/9) / log(27/8) = [log(4) - log(9)] / [log(27) - log(8)] = - 2/3
Saludos Herminio