Сравните дроби: 1) 8/21 и 6/14; 2) 13/24 и 15/36.

1. \(\frac{8}{21}=\frac{16}{42}\), а \(\frac{6}{14}=\frac{18}{42}\), поэтому \(\frac{8}{21}<\frac{6}{14}\).
2. \(\frac{13}{24}=\frac{39}{72}\), а \(\frac{15}{36}=\frac{30}{72}\), поэтому \(\frac{13}{24}>\frac{15}{36}\).

Ответ: 1) \(\frac{8}{21}<\frac{6}{14}\); 2) \(\frac{13}{24}>\frac{15}{36}\).