I numeri

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Across
  1. 1. 20-3=
  2. 4. 15-3=
  3. 5. 7+6=
  4. 6. 18-4=
  5. 8. 7+11=
  6. 9. 10+5=
Down
  1. 2. 13+3=
  2. 3. 12+8=
  3. 4. 20-1=
  4. 7. 3+8=