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Hanoi Open Mathematics Competition 2012 Junior Question 1

HOMC · Hanoi Open Mathematics Competition 2012 Junior

Question 1

Assume that \(a-b=-(a-b)\). Then:
  1. \(a=b\)
  2. \(a\lt b\)
  3. \(a\gt b\)
  4. It is impossible to compare a and b.