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[obm-l] Olimpiada da India
Oi, pessoal:
Soh faltam duas questoes pra gente fechar a Olimpiada da India de 1995:
2. Show that there are infinitely many pairs (a,b) of coprime integers
(which may be negative, but not zero) such that x^2 + ax + b = 0 and
x^2 + 2ax + b have integral roots.
5. x1, x2, ... , xn are reals > 1 such that |xi - x(i+1)| < 1 for i < n.
Show that x1/x2 + x2/x3 + ... + x(n-1)/xn + xn/x1 < 2n-1.
Quem se habilita?
[]s,
Claudio.
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