2.8. Приведите дробь к знаменателю 56: а) \(\frac{5a}{7}\); б) \(\frac{26m}{112}\); в) \(\frac{3k}{8}\); г) \(\frac{27t}{168}\).

1. \(\frac{5a}{7}=\frac{5a\cdot8}{7\cdot8}=\frac{40a}{56}\).
2. \(\frac{26m}{112}=\frac{26m:2}{112:2}=\frac{13m}{56}\).
3. \(\frac{3k}{8}=\frac{3k\cdot7}{8\cdot7}=\frac{21k}{56}\).
4. \(\frac{27t}{168}=\frac{27t:3}{168:3}=\frac{9t}{56}\).

Ответ: а) \(\frac{40a}{56}\); б) \(\frac{13m}{56}\); в) \(\frac{21k}{56}\); г) \(\frac{9t}{56}\).