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SMO 2017 Junior Round 1 Question 2

SMO · SMO 2017 Junior Round 1

Question 2

Let $a$ and $b$ be real numbers satisfying $\frac1a\lt \frac1b\lt 0$. Which of the following is incorrect?
  1. $|a|\lt |b|$
  2. $a>b$
  3. $a+b\lt ab$
  4. $a^3>b^3$
  5. $a^2>b^2$