1. Сократите дроби: $$\frac{20}{25}$$, $$\frac{48}{56}$$, $$\frac{42}{63}$$, $$\frac{108}{132}$$

1. $$\frac{20}{25} = \frac{4 \times 5}{5 \times 5} = \frac{4}{5}$$
2. $$\frac{48}{56} = \frac{6 \times 8}{7 \times 8} = \frac{6}{7}$$
3. $$\frac{42}{63} = \frac{6 \times 7}{9 \times 7} = \frac{6}{9} = \frac{2 \times 3}{3 \times 3} = \frac{2}{3}$$
4. $$\frac{108}{132} = \frac{9 \times 12}{11 \times 12} = \frac{9}{11}$$

Ответ: $$\frac{4}{5}$$, $$\frac{6}{7}$$, $$\frac{2}{3}$$, $$\frac{9}{11}$$