quinta ascendente = 3/2, quinta descendente = 2/3
quinta ascendente = 3/2, quinta descendente = 2/3
transporte de octava: cuarta ascendente = 4/3
tercera mayor = 5/4, tercera menor = 6/5
suma = 30/20 = 3/2 = quinta justa
quinta justa = 3/2, tercera mayor = 5/4
resta = 12/10 = 6/5 = tercera menor