211. Сократите дробь: 1) 3/12; 2) 4/12; 3) 6/54; 4) 25/70; 5) 26/65; 6) 12/60; 7) 36/48; 8) 35/105; 9) 480/720; 10) 204/306.

1. \(\frac{3}{12}=\frac{3:3}{12:3}=\frac{1}{4}\).
2. \(\frac{4}{12}=\frac{4:4}{12:4}=\frac{1}{3}\).
3. \(\frac{6}{54}=\frac{6:6}{54:6}=\frac{1}{9}\).
4. \(\frac{25}{70}=\frac{25:5}{70:5}=\frac{5}{14}\).
5. \(\frac{26}{65}=\frac{26:13}{65:13}=\frac{2}{5}\).
6. \(\frac{12}{60}=\frac{12:12}{60:12}=\frac{1}{5}\).
7. \(\frac{36}{48}=\frac{36:12}{48:12}=\frac{3}{4}\).
8. \(\frac{35}{105}=\frac{35:35}{105:35}=\frac{1}{3}\).
9. \(\frac{480}{720}=\frac{480:240}{720:240}=\frac{2}{3}\).
10. \(\frac{204}{306}=\frac{204:102}{306:102}=\frac{2}{3}\).

Ответ: 1) \(\frac{1}{4}\); 2) \(\frac{1}{3}\); 3) \(\frac{1}{9}\); 4) \(\frac{5}{14}\); 5) \(\frac{2}{5}\); 6) \(\frac{1}{5}\); 7) \(\frac{3}{4}\); 8) \(\frac{1}{3}\); 9) \(\frac{2}{3}\); 10) \(\frac{2}{3}\).