83.21 Chapter IV. Equations of the first order but not of the first degree. Exercise IV (D) at page 57

83.21.1 problem 1
83.21.2 problem 2
83.21.3 problem 3
83.21.4 problem 4
83.21.5 problem 5
83.21.6 problem 6
83.21.7 problem 7
83.21.8 problem 8
83.21.9 problem 9
83.21.10 problem 10