84.28 Chapter 16. Initial-value problems. Supplementary problems

84.28.1 problem 16.5
84.28.2 problem 16.6
84.28.3 problem 16.7
84.28.4 problem 16.8
84.28.5 problem 16.9
84.28.6 problem 16.10
84.28.7 problem 16.11
84.28.8 problem 16.13