Сократите дроби: 3/6; 8/16; 8/20; 42п/49п.

1. \(\frac{3}{6}=\frac{3:3}{6:3}=\frac{1}{2}\).
2. \(\frac{8}{16}=\frac{8:8}{16:8}=\frac{1}{2}\).
3. \(\frac{8}{20}=\frac{8:4}{20:4}=\frac{2}{5}\).
4. \(\frac{42п}{49п}=\frac{42}{49}=\frac{6}{7}\), при \(п\ne0\).

Ответ: \(\frac{1}{2};\ \frac{1}{2};\ \frac{2}{5};\ \frac{6}{7}\).