Addizioni e sottrazioni

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Across
  1. 3. 6+4+6+4=
  2. 7. 19-2-2=
  3. 8. 3+9+4=
  4. 9. 12-8=
  5. 11. 18-3-3=
  6. 12. 7+5+6=
Down
  1. 1. 6+5=
  2. 2. 17-2-1=
  3. 4. 8+6+5
  4. 5. 4+7+6=
  5. 6. 19-9-5=
  6. 10. 20-6-1=