BODMAS Rule!

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Across
  1. 1. (1+20-16/4^2)/((5-3)^2+12/2)
  2. 3. [18-2(5+1)]/3+7
  3. 4. (9*3/9+1)*3
  4. 6. 72/((7-5)*2)
  5. 7. 100–3[20+{50–40}]
  6. 8. [50-{3*(9+7)}]
  7. 9. 36/6*3+2^2-(3+5)
Down
  1. 1. (7*8-4)/(6-2)
  2. 2. 25–[20–{10-(7-5-3)}
  3. 5. (2*8/4+2)*3