Ответ:

  1. \(\frac{2}{15}+\frac{5}{15}=\frac{7}{15}\); \(\frac{15}{15}+\frac{5}{15}=\frac{20}{15}=1\frac{1}{3}\).
  2. \(\frac{26}{100}+\frac{28}{100}=\frac{54}{100}=\frac{27}{50}\).
  3. \(\frac{64}{207}+\frac{51}{207}=\frac{115}{207}\).
  4. \(\frac{38}{50}+\frac{16}{50}=\frac{54}{50}=1\frac{2}{25}\).
  5. \(\frac{85}{90}+\frac{2}{90}=\frac{87}{90}=\frac{29}{30}\).
  6. \(\frac{32}{165}+\frac{83}{165}=\frac{115}{165}=\frac{23}{33}\).