- \(\left(\frac{1}{12}-\frac{17}{15}\right)\cdot\frac{10}{3}=\left(\frac{5}{60}-\frac{68}{60}\right)\cdot\frac{10}{3}=-\frac{21}{20}\cdot\frac{10}{3}=-\frac{7}{2}\).
- \(\left(\frac{7}{15}+\frac{19}{30}\right)\cdot\frac{9}{11}=\frac{14+19}{30}\cdot\frac{9}{11}=1\).
- \(\left(\frac{3}{25}-\frac{2}{35}\right)\cdot14=\left(\frac{21-10}{175}\right)\cdot14=\frac{22}{25}\).
- \(\left(\frac{1}{30}+\frac{7}{10}\right)\cdot6=\frac{22}{30}\cdot6=\frac{22}{5}=4\frac{2}{5}\).
Ответ: 1) \(-\frac{7}{2}\); 2) 1; 3) \(\frac{22}{25}\); 4) \(4\frac{2}{5}\).