Ответ:

  1. \(35+28:7=35+4=39\)
  2. \((35+28):7=63:7=9\)
  3. \(9\cdot(5-5)=9\cdot0=0\)
  4. \(9\cdot5-5=45-5=40\)
  5. \((8+24):4=32:4=8\)
  6. \(8+24:4=8+6=14\)
  7. \(45:5\cdot9=9\cdot9=81\)
  8. \(45:(5\cdot9)=45:45=1\)
  9. \(100-28:4=100-7=93\)
  10. \((100-28):4=72:4=18\)
  11. \(9\cdot4+4=36+4=40\)
  12. \(9\cdot(4+4)=9\cdot8=72\)
  13. \(28:7+21=4+21=25\)
  14. \(28:(7+21)=28:28=1\)
  15. \(6+44:2=6+22=28\)
  16. \((6+44):2=50:2=25\)
  17. \(8\cdot10-7\cdot4=80-28=52\)
  18. \(8\cdot(10-7)\cdot4=8\cdot3\cdot4=96\)