Ответ:

  1. \(5-(5+5):5=3\)
  2. \(5-5:5+5-5=4\)
  3. \((5-5)\cdot5+5=5\)
  4. \(5+5:5+5-5=6\)
  5. \(5+5:5+5:5=7\)
  6. \(55-5\cdot5=30\)
  7. \(5\cdot5+5\cdot5=50\)
  8. \(5\cdot5\cdot5-5=120\)