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SMO 2011 Senior Round 1 Question 1

SMO · SMO 2011 Senior Round 1

Question 1

Suppose $a,b,c$ are nonzero real numbers such that
$$\frac{a^2}{b^2+c^2}\lt\frac{b^2}{c^2+a^2}\lt\frac{c^2}{a^2+b^2}.$$
Which of the following statements is always true?
  1. $a\lt b\lt c$
  2. $|a|\lt|b|\lt|c|$
  3. $c\lt b\lt a$
  4. $|b|\lt|c|\lt|a|$
  5. $|c|\lt|b|\lt|a|$