а)

${\displaystyle \frac{16}{7}}\times {\displaystyle \frac{21}{256}}$

б)

${\displaystyle \frac{15}{9}}\times {\displaystyle \frac{27}{40}}$

в)

${\displaystyle \frac{13}{18}}\times {\displaystyle \frac{36}{26}}$

г)

${\displaystyle \frac{24}{85}}\times {\displaystyle \frac{51}{42}}$

д)

${\displaystyle \frac{56}{57}}\times {\displaystyle \frac{38}{24}}$

е)

${\displaystyle \frac{24}{1440}}\times {\displaystyle \frac{360}{3}}\times {\displaystyle \frac{336}{360}}$

ж)

${\displaystyle \frac{2}{5}}\times {\displaystyle \frac{5}{3}}\times {\displaystyle \frac{3}{7}}\times {\displaystyle \frac{7}{2}}$

и)

${\displaystyle \frac{11}{12}}\times {\displaystyle \frac{3}{7}}\times {\displaystyle \frac{7}{11}}\times {\displaystyle \frac{12}{3}}$

к)

${\displaystyle \frac{6}{8}}\times {\displaystyle \frac{9}{10}}\times {\displaystyle \frac{10}{12}}\times {\displaystyle \frac{16}{20}}$

л)

${\displaystyle \frac{22}{5}}\times {\displaystyle \frac{1}{7}}\times {\displaystyle \frac{1}{11}}\times {\displaystyle \frac{1}{3}}$

м)

${\displaystyle \frac{2}{7}}\times {\displaystyle \frac{3}{8}}\times {\displaystyle \frac{3}{10}}\times {\displaystyle \frac{4}{6}}$

н)

${\displaystyle \frac{4}{3}}\times {\displaystyle \frac{2}{6}}\times {\displaystyle \frac{10}{3}}\times {\displaystyle \frac{11}{9}}$