446. Выполните деление: 1) 2/7 : 5/6; 2) 3/14 : 2/21; 3) 7/16 : 42/48; 4) 3/4 : 21/40; 5) 9/25 : 27/50; 6) 45/56 : 63/64; 7) 2/3 : 1/6; 8) 65/98 : 26/49.

Деление на дробь заменяем умножением на обратную дробь.

1. \(\frac{2}{7}:\frac{5}{6}=\frac{2}{7}\cdot\frac{6}{5}=\frac{12}{35}\).
2. \(\frac{3}{14}:\frac{2}{21}=\frac{3}{14}\cdot\frac{21}{2}=\frac{9}{4}\).
3. \(\frac{7}{16}:\frac{42}{48}=\frac{7}{16}\cdot\frac{48}{42}=\frac{1}{2}\).
4. \(\frac{3}{4}:\frac{21}{40}=\frac{3}{4}\cdot\frac{40}{21}=\frac{10}{7}\).
5. \(\frac{9}{25}:\frac{27}{50}=\frac{9}{25}\cdot\frac{50}{27}=\frac{2}{3}\).
6. \(\frac{45}{56}:\frac{63}{64}=\frac{45}{56}\cdot\frac{64}{63}=\frac{40}{49}\).
7. \(\frac{2}{3}:\frac{1}{6}=\frac{2}{3}\cdot6=4\).
8. \(\frac{65}{98}:\frac{26}{49}=\frac{65}{98}\cdot\frac{49}{26}=\frac{5}{4}\).