Limites, lim [x^(1/n) -a^(1/n)] / [x^(1/m) -a^(1/m)]

[Tiagofb]

Calcule:

lim [x^(1/n) -a^(1/n)] / [x^(1/m) -a^(1/m)] = ?
x→a

[Sobolev]

Já respondido noutro post.