Ответ:

  1. \(\frac{15}{100}+\frac{15}{100}=\frac{30}{100}=\frac{3}{10}\);
  2. \(\frac{26}{100}+\frac{28}{100}=\frac{54}{100}=\frac{27}{50}\);
  3. \(\frac{207}{2007}+\frac{51}{2007}=\frac{258}{2007}=\frac{86}{669}\);
  4. \(\frac{38}{50}-\frac{16}{50}=\frac{22}{50}=\frac{11}{25}\);
  5. \(\frac{85}{90}+\frac{2}{90}=\frac{87}{90}=\frac{29}{30}\);
  6. \(\frac{32}{165}+\frac{83}{165}=\frac{115}{165}=\frac{23}{33}\).