簡易數學術語

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Across
  1. 6. On the fractions up?
  2. 7. What is ( )
  3. 9. In the fractions down?
Down
  1. 1. What is -?
  2. 2. What is [ ]
  3. 3. divide number this is has quotient and ？
  4. 4. what is x?
  5. 5. Once every four years of February
  6. 8. What is +?