A question in field theory!

From: Cooper <cooper0040@xxxxxxxxx>
Date: Thu, 14 Feb 2008 05:28:01 -0800 (PST)

Hi!

I want to ask some question in field theory.

Assume Q(root(r))=Q(root(s)) for real number r, s.

Then, show that r/s=t^2 for some rational number t.

(here Q is the set of all rational number)

I cannot find any light. Do you have any idea?
.

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