cruciverba matematico

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Across
  1. 1. =100+31+50-73-27
  2. 3. =250-180+32
  3. 5. =50-14
  4. 6. =6x20
  5. 8. =2/3 di 75
  6. 9. =2/8 di 400
Down
  1. 1. =8x11
  2. 2. =21:3
  3. 4. =105:3
  4. 7. =35+28-40