a) |N - M| = |-2 - (-9)| = |-2 + 9| = |7| = 7
б) |D - C| = |-4,3 - 2,6| = |-6,9| = 6,9
в) $$|K - P| = |\frac{3}{7} - (-\frac{5}{7})| = |\frac{3}{7} + \frac{5}{7}| = |\frac{8}{7}| = \frac{8}{7} = 1\frac{1}{7}$$
г) $$|Q - L| = |1\frac{1}{6} - (-3\frac{5}{6})| = |1\frac{1}{6} + 3\frac{5}{6}| = |\frac{7}{6} + \frac{23}{6}| = |\frac{30}{6}| = |5| = 5$$