The impossible puzzle

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Across
  1. 5. 3x(65/9)=
  2. 8. (576/84)x(68/357)=
  3. 10. 4+(7/2)=
Down
  1. 1. (39/2)+(21/4)=
  2. 2. (81/16)/(91/18)=
  3. 3. (19/1)x(51/9)=
  4. 4. 3x(7/2)=
  5. 6. 3-(4/3)=
  6. 7. 18-(4/3)=
  7. 9. 13-(95/8)=