Ответ:

  1. а) \(1\frac{1}{8}-\frac{6}{8}=1-\frac{5}{8}=\frac{3}{8}\); \(5\frac{2}{5}-\frac{3}{5}=4\frac{4}{5}\); \(4\frac{1}{9}-\frac{5}{6}=4+\frac{2}{18}-\frac{15}{18}=3\frac{13}{18}\).
  2. б) \(12\frac{5}{8}-5\frac{11}{12}=12\frac{15}{24}-5\frac{22}{24}=6\frac{17}{24}\); \(3\frac{7}{16}-1\frac{5}{8}=3\frac{7}{16}-1\frac{10}{16}=2\frac{13}{16}\); \(6\frac{2}{15}-3\frac{2}{3}=6\frac{2}{15}-3\frac{10}{15}=2\frac{7}{15}\).