Ответ:

  1. \(\frac{3}{6}+\frac{1}{3}=\frac{3}{6}+\frac{2}{6}=\frac{5}{6}\).

  2. \(\frac{5}{8}+\frac{8}{24}=\frac{15}{24}+\frac{8}{24}=\frac{23}{24}\).

  3. \(\frac{15}{16}\cdot\frac{64}{25}=\frac{15\cdot4}{25}=\frac{60}{25}=\frac{12}{5}\).

  4. \(\frac{8}{3}\cdot\frac{16}{18}=\frac{8}{3}\cdot\frac{8}{9}=\frac{64}{27}\).

  5. \(\frac{15}{16}-\frac{3}{32}=\frac{30}{32}-\frac{3}{32}=\frac{27}{32}\).

  6. \(\frac{8}{9}+\frac{49}{70}=\frac{560}{630}+\frac{441}{630}=\frac{1001}{630}\).

  7. \(\frac{15}{25}:\frac{50}{25}=\frac{15}{25}\cdot\frac{25}{50}=\frac{15}{50}=\frac{3}{10}\).

  8. \(\frac{126}{82}:\frac{372}{246}=\frac{63}{41}\cdot\frac{41}{62}=\frac{63}{62}\).

Ответ: а) \(\frac{5}{6}\); б) \(\frac{23}{24}\); в) \(\frac{12}{5}\); г) \(\frac{64}{27}\); д) \(\frac{27}{32}\); е) \(\frac{1001}{630}\); ж) \(\frac{3}{10}\); з) \(\frac{63}{62}\).