1. Сократить дроби: 10/20, 15/25, 39/78, 120/220, 64/108

1. Сокращение дробей:

• \(\frac{10}{20} = \frac{1 \cdot 10}{2 \cdot 10} = \frac{1}{2}\)
• \(\frac{15}{25} = \frac{3 \cdot 5}{5 \cdot 5} = \frac{3}{5}\)
• \(\frac{39}{78} = \frac{1 \cdot 39}{2 \cdot 39} = \frac{1}{2}\)
• \(\frac{120}{220} = \frac{12 \cdot 10}{22 \cdot 10} = \frac{12}{22} = \frac{6 \cdot 2}{11 \cdot 2} = \frac{6}{11}\)
• \(\frac{64}{108} = \frac{16 \cdot 4}{27 \cdot 4} = \frac{16}{27}\)

Ответ: 1/2, 3/5, 1/2, 6/11, 16/27.