335. Найдите произведение: 1) 2/5 * 3/7; 2) 3/4 * 5/6; 3) 4/7 * 7/9; 4) 15/16 * 48/55; 5) 22/25 * 10/77; 6) 13/24 * 16/39; 7) 6/35 * 14/15; 8) 36/85 * 34/39

1) \(\frac{2}{5} \cdot \frac{3}{7} = \frac{2 \cdot 3}{5 \cdot 7} = \frac{6}{35}\) 2) \(\frac{3}{4} \cdot \frac{5}{6} = \frac{3 \cdot 5}{4 \cdot 6} = \frac{15}{24} = \frac{5}{8}\) 3) \(\frac{4}{7} \cdot \frac{7}{9} = \frac{4 \cdot 7}{7 \cdot 9} = \frac{28}{63} = \frac{4}{9}\) 4) \(\frac{15}{16} \cdot \frac{48}{55} = \frac{15 \cdot 48}{16 \cdot 55} = \frac{720}{880} = \frac{72}{88} = \frac{9}{11}\) 5) \(\frac{22}{25} \cdot \frac{10}{77} = \frac{22 \cdot 10}{25 \cdot 77} = \frac{220}{1925} = \frac{4}{35}\) 6) \(\frac{13}{24} \cdot \frac{16}{39} = \frac{13 \cdot 16}{24 \cdot 39} = \frac{208}{936} = \frac{2}{9}\) 7) \(\frac{6}{35} \cdot \frac{14}{15} = \frac{6 \cdot 14}{35 \cdot 15} = \frac{84}{525} = \frac{4}{25}\) 8) \(\frac{36}{85} \cdot \frac{34}{39} = \frac{36 \cdot 34}{85 \cdot 39} = \frac{1224}{3315} = \frac{408}{1105}\)