Ответ:
- \(\frac{5}{9}:\frac{10}{27}=\frac{5}{9}\cdot\frac{27}{10}=\frac{3}{2}=1\frac{1}{2}\).
- \(\frac{7}{10}-\frac{3}{20}=\frac{14}{20}-\frac{3}{20}=\frac{11}{20}\).
- \(\frac{6}{25}\cdot\frac{5}{18}=\frac{1}{15}\).
- \(5\frac{2}{7}=\frac{107}{21}\), \(2\frac{4}{21}=\frac{46}{21}\), \(3\frac{2}{3}=\frac{77}{21}\).
\(\frac{107}{21}-\frac{46}{21}+\frac{77}{21}=\frac{138}{21}=\frac{46}{7}=6\frac{4}{7}\).
Ответ: а) 1 1/2; б) 11/20; в) 1/15; г) 6 4/7.
