Ответ:

  1. \(5.6-3.5\cdot2.4=5.6-8.4=-2.8\).
  2. \[\frac{11}{13}:\left(-\frac{22}{39}\right)+4.1=-\frac32+4.1=2.6.\]
  3. \[-\frac{14}{55}\cdot\frac7{33}-3.52=-\frac{98}{1815}-3.52=-\frac{3191}{825}.\]

Ответ: 1) −2,8; 2) 2,6; 3) \(-\frac{3191}{825}\).