Ответ:
а) \(\frac{3}{10}\cdot\frac{5}{7}+\frac{11}{14}=\frac{3}{14}+\frac{11}{14}=1\).
б) \(\frac{11}{15}+\frac{2}{3}\cdot\frac{9}{10}=\frac{11}{15}+\frac{3}{5}=\frac{11}{15}+\frac{9}{15}=\frac{4}{3}=1\frac{1}{3}\).
в) \(1\frac{1}{2}-\frac{9}{20}\cdot\frac{5}{9}=\frac{3}{2}-\frac{1}{4}=\frac{6}{4}-\frac{1}{4}=\frac{5}{4}=1\frac{1}{4}\).
г) \(\frac{4}{15}\cdot\frac{3}{4}-\frac{1}{10}=\frac{1}{5}-\frac{1}{10}=\frac{1}{10}\).
Ответ: а) \(1\); б) \(1\frac{1}{3}\); в) \(1\frac{1}{4}\); г) \(\frac{1}{10}\).
