**Решение:**
a) (17 + (-5) = 17 - 5 = 12)
б) (-21 + 19 = -2)
в) (-8 + (-43) = -8 - 43 = -51)
г) (-15 + (-18) = -15 - 18 = -33)
д) (-0,5 + 6 = 5,5)
e) (-2,4 + (-3,2) = -2,4 - 3,2 = -5,6)
ж) (6,1 + (-8,3) = 6,1 - 8,3 = -2,2)
з) (-3,84 + 4,16 = 0,32)
и) (\frac{-2}{9} + \frac{5}{9} = \frac{-2 + 5}{9} = \frac{3}{9} = \frac{1}{3})
к) (\frac{-4}{7} + \frac{2}{7} = \frac{-4 + 2}{7} = \frac{-2}{7})
л) (\frac{5}{8} + (\frac{-7}{12}) = \frac{5}{8} - \frac{7}{12} = \frac{15}{24} - \frac{14}{24} = \frac{1}{24})
м) (-1 + \frac{3}{5} = \frac{-5}{5} + \frac{3}{5} = \frac{-2}{5})
н) (-2 + 1\frac{3}{4} = -2 + \frac{7}{4} = \frac{-8}{4} + \frac{7}{4} = \frac{-1}{4} = -0,25)
о) (3 + (-1\frac{2}{7}) = 3 - \frac{9}{7} = \frac{21}{7} - \frac{9}{7} = \frac{12}{7} = 1\frac{5}{7})
п) (2\frac{2}{3} + (-1\frac{5}{6}) = \frac{8}{3} - \frac{11}{6} = \frac{16}{6} - \frac{11}{6} = \frac{5}{6})
p) (-5\frac{1}{3} + 4,5 = -\frac{16}{3} + \frac{9}{2} = \frac{-32}{6} + \frac{27}{6} = \frac{-5}{6})