Maths Puzzle

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Across
  1. 3. (9+9)/2
  2. 4. 1000/(5*2*5*2)
  3. 5. 625/(5*5*5)
  4. 7. cubic root of 64
  5. 9. 2(2(5))
  6. 11. (6+3)*(3*3)/27
Down
  1. 1. 108/6
  2. 2. (7*7)/(4+3)
  3. 5. ((5*2)*(2*2)*(2*2))/4
  4. 6. 360/(3*2)
  5. 8. 21-(15+5)
  6. 10. 14(5+2)