Ответ:

  1. \(1.54-0.5\cdot1.3=1.54-0.65=0.89\).
  2. \(2.34-0.7\cdot1.6=2.34-1.12=1.22\).
  3. \(3.25-0.3\cdot2.1=3.25-0.63=2.62\).
  4. \(0.2\cdot2.6-3.89=0.52-3.89=-3.37\).
  5. \(1.5\cdot3.1-2.63=4.65-2.63=2.02\).
  6. \(3.54+0.5\cdot1.3=3.54+0.65=4.19\).
  7. \((3.7-5.9):0.4=-2.2:0.4=-5.5\).
  8. \((3.7-5.2)\cdot0.8=-1.5\cdot0.8=-1.2\).
  9. \(2.81\cdot3.4-5.66=9.554-5.66=3.894\).
  10. \(-7.1+7.68:1.2=-7.1+6.4=-0.7\).
  11. \(-8.8+6.5\cdot1.6=-8.8+10.4=1.6\).
  12. \((2.3-5.9):40=-3.6:40=-0.09\).
  13. \((4.2-6.6):60=-2.4:60=-0.04\).
  14. \(-7.5+15.3:1.5=-7.5+10.2=2.7\).
  15. \(7.84-0.7\cdot1.2=7.84-0.84=7\).