Puzzle based on polynomial

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Across
  1. 4. part of operation connected by addition and subtraction symbol
  2. 6. expression of three terms
  3. 7. a number in front of a variable
  4. 9. an expression with many terms
  5. 10. expression of two term
Down
  1. 1. made up of number variable and operations
  2. 2. unfixed value
  3. 3. the highest power in the polynomial
  4. 5. expression of one term
  5. 8. fixed value