cross factorial puzzle

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Across
  1. 2. 7! -8!= ?
  2. 3. 4! +5! = ?
  3. 7. 7!x4! = ?
  4. 8. 6-3! = ?
  5. 10. 12!11!= ?
  6. 11. 12! 10! - 6! = ?
  7. 12. 3! +6!= ?
  8. 13. 15!12! 3! = ?
  9. 16. 5!x7! = ?
  10. 18. 3!x2!
Down
  1. 1. 2!+6! - 7! = ?
  2. 2. 11! +3! = ?
  3. 4. 8! +6! = ?
  4. 5. 10! -8! = ?
  5. 6. 8! x2 != ?
  6. 9. 8! ÷13! = ?
  7. 12. 6! -8!x2!= ?
  8. 14. 8! 6! = ?
  9. 15. 2!+8! x3! = ?|
  10. 17. 7÷8! = ?