Ответ:

  1. \(1\frac{9}{11}+2\frac{3}{11}=3\frac{12}{11}=4\frac{1}{11}\).
  2. \(3\frac{2}{9}+1\frac{7}{9}=4\frac{9}{9}=5\).
  3. \(4\frac{1}{3}-2\frac{2}{3}=\frac{13}{3}-\frac{8}{3}=\frac{5}{3}=1\frac{2}{3}\).
  4. \(26\frac{2}{5}-17\frac{3}{5}=\frac{132}{5}-\frac{88}{5}=\frac{44}{5}=8\frac{4}{5}\).
  5. \(8\frac{2}{7}-3\frac{4}{7}=\frac{58}{7}-\frac{25}{7}=\frac{33}{7}=4\frac{5}{7}\).

Ответ: а) \(4\frac{1}{11}\); б) \(5\); в) \(1\frac{2}{3}\); г) \(8\frac{4}{5}\); д) \(4\frac{5}{7}\).