38.1 Program 24. First order differential equations. Test excercise 24. page 1067

38.1.1 problem 1
38.1.2 problem 2
38.1.3 problem 3
38.1.4 problem 4
38.1.5 problem 5
38.1.6 problem 6
38.1.7 problem 7
38.1.8 problem 8
38.1.9 problem 9
38.1.10 problem 10
38.1.11 problem 11
38.1.12 problem 12