84.16 Chapter 8. Linear first-order differential equations. Supplementary problems

84.16.1 problem 8.10
84.16.2 problem 8.11
84.16.3 problem 8.12
84.16.4 problem 8.13
84.16.5 problem 8.14
84.16.6 problem 8.15
84.16.7 problem 8.16
84.16.8 problem 8.17
84.16.9 problem 8.18
84.16.10 problem 8.19
84.16.11 problem 8.20
84.16.12 problem 8.21