1) Сократите дроби: 2) 4/12; 4) 25/70; 6) 12/60; 8) 35/105; 10) 204/306.

1. \(\frac{4}{12}=\frac{4\mathbin{:}4}{12\mathbin{:}4}=\frac{1}{3}\).
2. \(\frac{25}{70}=\frac{25\mathbin{:}5}{70\mathbin{:}5}=\frac{5}{14}\).
3. \(\frac{12}{60}=\frac{12\mathbin{:}12}{60\mathbin{:}12}=\frac{1}{5}\).
4. \(\frac{35}{105}=\frac{35\mathbin{:}35}{105\mathbin{:}35}=\frac{1}{3}\).
5. \(\frac{204}{306}=\frac{204\mathbin{:}102}{306\mathbin{:}102}=\frac{2}{3}\).

Ответ: 2) \(\frac{1}{3}\); 4) \(\frac{5}{14}\); 6) \(\frac{1}{5}\); 8) \(\frac{1}{3}\); 10) \(\frac{2}{3}\).