№1. Выполнить деление: 1) 2/3 : 1/6; 2) 3/4 : 21/40; 3) 9/25 : 27/50; 4) 65/98 : 26/49; 5) 11/15 : 3/8; 6) 21/40 : 3/4; 7) 44/55 : 1/5; 8) 63/64 : 45/56; 9) 6 : 7/9; 10) 16 : 4/11; 11) 9/16 : 6; 12) 1 5/7 : 1 8/27; 13) 2 4/7 : 1 1/35.

1. \(\frac{2}{3}:\frac{1}{6}=\frac{2}{3}\cdot6=4\).
2. \(\frac{3}{4}:\frac{21}{40}=\frac{3}{4}\cdot\frac{40}{21}=\frac{10}{7}\).
3. \(\frac{9}{25}:\frac{27}{50}=\frac{9}{25}\cdot\frac{50}{27}=\frac{2}{3}\).
4. \(\frac{65}{98}:\frac{26}{49}=\frac{65}{98}\cdot\frac{49}{26}=\frac{5}{4}=1\frac{1}{4}\).
5. \(\frac{11}{15}:\frac{3}{8}=\frac{11}{15}\cdot\frac{8}{3}=\frac{88}{45}=1\frac{43}{45}\).
6. \(\frac{21}{40}:\frac{3}{4}=\frac{21}{40}\cdot\frac{4}{3}=\frac{7}{10}\).
7. \(\frac{44}{55}:\frac{1}{5}=\frac{4}{5}\cdot5=4\).
8. \(\frac{63}{64}:\frac{45}{56}=\frac{63}{64}\cdot\frac{56}{45}=\frac{49}{40}=1\frac{9}{40}\).
9. \(6:\frac{7}{9}=6\cdot\frac{9}{7}=\frac{54}{7}=7\frac{5}{7}\).
10. \(16:\frac{4}{11}=16\cdot\frac{11}{4}=44\).
11. \(\frac{9}{16}:6=\frac{9}{16}\cdot\frac{1}{6}=\frac{3}{32}\).
12. \(1\frac{5}{7}:1\frac{8}{27}=\frac{12}{7}:\frac{35}{27}=\frac{12}{7}\cdot\frac{27}{35}=\frac{324}{245}=1\frac{79}{245}\).
13. \(2\frac{4}{7}:1\frac{1}{35}=\frac{18}{7}:\frac{36}{35}=\frac{18}{7}\cdot\frac{35}{36}=\frac{5}{2}=2\frac{1}{2}\).

Ответ: 1) 4; 2) 10/7; 3) 2/3; 4) 1 1/4; 5) 1 43/45; 6) 7/10; 7) 4; 8) 1 9/40; 9) 7 5/7; 10) 44; 11) 3/32; 12) 1 79/245; 13) 2 1/2.