Ответ:

  1. \(1.4\cdot6=8.4\).
  2. \(5.6\cdot(-7)=-39.2\).
  3. \(0.6:(-1.2)=-0.5\).
  4. \(2.5\cdot0.04=0.1\).
  5. \(6.03+0.63=6.66\).
  6. \(0.37-5.63=-5.26\).
  7. \((-2/3)\cdot(-9/16)=18/48=3/8\).
  8. \((4/5):(-2/15)=(4/5)\cdot(-15/2)=-6\).
  9. \(-3\frac{1}{5}-6.3=-3.2-6.3=-9.5\).
  10. \(6-2\frac{2}{9}=6-\frac{20}{9}=\frac{34}{9}=3\frac{7}{9}\).
  11. \(-5.6:100=-0.056\).
  12. \((-0.001)\cdot(-63)=0.063\).
  13. \(5.48\cdot(-10000)=-54800\).
  14. \(11:0.01=1100\).
  15. \(2\cdot(-2.077)\cdot5=-20.77\).
  16. \(\frac12\cdot(-263.6)\cdot40=-5272\).
  17. \(-2\frac25\cdot\frac5{12}=-\frac{12}{5}\cdot\frac5{12}=-1\).
  18. \(\frac12:0.2=2.5\).
  19. \(-4\frac38-(-3\frac18)=-1\frac14\).
  20. \(-2\frac25+3\frac25=1\).

Ответ: 1) 8,4; 2) −39,2; 3) −0,5; 4) 0,1; 5) 6,66; 6) −5,26; 7) 3/8; 8) −6; 9) −9,5; 10) 3 7/9; 11) −0,056; 12) 0,063; 13) −54800; 14) 1100; 15) −20,77; 16) −5272; 17) −1; 18) 2,5; 19) −1 1/4; 20) 1.