Solutions:
1). Domain
a) \(x≠5, -4\)
b) \(x≠0,5\)
c) \(x≠4,-3\)
2)
a) \(\Large \frac{x-1}{x-5}\)
b) \(-\Large\frac{x+5}{x}\)
c) \(\Large \frac{x+4}{x-3}\)
3)
a). \(\frac{1}{2}, \, \frac{1}{5}, \, \normalsize -1\)
b). \(\normalsize -6, \, -\Large\frac{8}{3}, \, -\Large\frac{9}{4}\)
c). \( \normalsize 0, \, \Large \frac{4}{5}, \, \frac{7}{6}\)