210. Сократите дробь: 1) \(\frac{5}{15}\); 2) \(\frac{6}{20}\); 3) \(\frac{14}{35}\); 4) \(\frac{21}{39}\); 5) \(\frac{10}{60}\); 6) \(\frac{28}{84}\); 7) \(\frac{56}{72}\); 8) \(\frac{20}{25}\); 9) \(\frac{120}{180}\); 10) \(\frac{207}{243}\).

1. \(\frac{5}{15}=\frac{1}{3}\);
2. \(\frac{6}{20}=\frac{3}{10}\);
3. \(\frac{14}{35}=\frac{2}{5}\);
4. \(\frac{21}{39}=\frac{7}{13}\);
5. \(\frac{10}{60}=\frac{1}{6}\);
6. \(\frac{28}{84}=\frac{1}{3}\);
7. \(\frac{56}{72}=\frac{7}{9}\);
8. \(\frac{20}{25}=\frac{4}{5}\);
9. \(\frac{120}{180}=\frac{2}{3}\);
10. \(\frac{207}{243}=\frac{23}{27}\).

Ответ: \(\frac13;\ \frac3{10};\ \frac25;\ \frac7{13};\ \frac16;\ \frac13;\ \frac79;\ \frac45;\ \frac23;\ \frac{23}{27}\).