Задание 2. Найдите значение выражения: 1) (2 3/17 + 1/34) · 17; 2) (1 1/4 − 3/19) · 19; 3) 4 3/8 : (3/8 + 1 4/13); 4) 5 2/5 : (3 1/4 − 2 4/5).

1. \[\left(2\frac{3}{17}+\frac{1}{34}\right)\cdot17=\left(\frac{139}{34}+\frac{1}{34}\right)\cdot17=\frac{140}{34}\cdot17=70.\]
2. \[\left(1\frac{1}{4}-\frac{3}{19}\right)\cdot19=\left(\frac{5}{4}-\frac{3}{19}\right)\cdot19=\frac{83}{76}\cdot19=\frac{83}{4}=20\frac{3}{4}.\]
3. \[4\frac{3}{8}:\left(\frac{3}{8}+1\frac{4}{13}\right)=\frac{35}{8}:\frac{47}{13}=\frac{35}{8}\cdot\frac{13}{47}=\frac{455}{376}.\]
4. \[5\frac{2}{5}:\left(3\frac{1}{4}-2\frac{4}{5}\right)=\frac{27}{5}:\frac{9}{20}=12.\]

Ответ: 1) 70; 2) \(20\frac{3}{4}\); 3) \(\frac{455}{376}\); 4) 12.