88.4 Chapter 2. Differential equations of first order. Exercise at page 33

88.4.1 problem 1
88.4.2 problem 2
88.4.3 problem 3
88.4.4 problem 4
88.4.5 problem 5
88.4.6 problem 6
88.4.7 problem 7
88.4.8 problem 8
88.4.9 problem 9
88.4.10 problem 10