Ответ:
\[\frac{11}{20}\cdot\frac{15}{22}+\frac{7}{18}\cdot\frac{9}{14}=\frac{3}{8}+\frac{1}{4}=\frac{3}{8}+\frac{2}{8}=\frac{5}{8}.\]
Ответ: \(\frac{5}{8}\)
\[\frac{11}{20}\cdot\frac{15}{22}+\frac{7}{18}\cdot\frac{9}{14}=\frac{3}{8}+\frac{1}{4}=\frac{3}{8}+\frac{2}{8}=\frac{5}{8}.\]
Ответ: \(\frac{5}{8}\)