3. Вычислите: а) 4 3/7 + 2 1/14; б) 5 1/15 − 9 3/10; в) 2 2/5 · (−1 2/3); г) −2 1/4 : (−3/5).

1. \(4\frac{3}{7}+2\frac{1}{14}=4\frac{6}{14}+2\frac{1}{14}=6\frac{7}{14}=6\frac{1}{2}\).
2. \(5\frac{1}{15}-9\frac{3}{10}=\frac{76}{15}-\frac{93}{10}=\frac{152-279}{30}=-\frac{127}{30}=-4\frac{7}{30}\).
3. \(2\frac{2}{5}\cdot\left(-1\frac{2}{3}\right)=\frac{12}{5}\cdot\left(-\frac{5}{3}\right)=-4\).
4. \(-2\frac{1}{4}:\left(-\frac{3}{5}\right)=-\frac{9}{4}\cdot\left(-\frac{5}{3}\right)=\frac{15}{4}=3\frac{3}{4}\).

Ответ: а) \(6\frac{1}{2}\); б) \(-4\frac{7}{30}\); в) \(-4\); г) \(3\frac{3}{4}\).