2 вариант. 1. Найдите значение выражения 1) \(\frac{19}{28} + \frac{16}{28} - \frac{17}{28}\) 2) \(4 \frac{11}{14} - 2 \frac{5}{14} + 1 \frac{3}{14}\) 3) \(1 - \frac{8}{17}\) 4) \(4 \frac{5}{9} - 2 \frac{8}{9}\) 5) \(4 \frac{4}{9} \cdot 2 \frac{5}{8}\) 6) \(\frac{8}{13}:4\) 7) \(2 \frac{3}{8} : 3 \frac{1}{5} \cdot \frac{19}{20}\)

**1. Найдите значение выражения** 1) \(\frac{19}{28} + \frac{16}{28} - \frac{17}{28} = \frac{19+16-17}{28} = \frac{18}{28} = \frac{9}{14}\) 2) \(4 \frac{11}{14} - 2 \frac{5}{14} + 1 \frac{3}{14} = (4-2+1) + (\frac{11}{14} - \frac{5}{14} + \frac{3}{14}) = 3 + \frac{11-5+3}{14} = 3 + \frac{9}{14} = 3 \frac{9}{14}\) 3) \(1 - \frac{8}{17} = \frac{17}{17} - \frac{8}{17} = \frac{17-8}{17} = \frac{9}{17}\) 4) \(4 \frac{5}{9} - 2 \frac{8}{9} = \frac{41}{9} - \frac{26}{9} = \frac{41-26}{9} = \frac{15}{9} = \frac{5}{3} = 1 \frac{2}{3}\) 5) \(4 \frac{4}{9} \cdot 2 \frac{5}{8} = \frac{40}{9} \cdot \frac{21}{8} = \frac{40 \cdot 21}{9 \cdot 8} = \frac{5 \cdot 7}{3 \cdot 1} = \frac{35}{3} = 11 \frac{2}{3}\) 6) \(\frac{8}{13}:4 = \frac{8}{13} \cdot \frac{1}{4} = \frac{8 \cdot 1}{13 \cdot 4} = \frac{2 \cdot 1}{13 \cdot 1} = \frac{2}{13}\) 7) \(2 \frac{3}{8} : 3 \frac{1}{5} \cdot \frac{19}{20} = \frac{19}{8} : \frac{16}{5} \cdot \frac{19}{20} = \frac{19}{8} \cdot \frac{5}{16} \cdot \frac{19}{20} = \frac{19 \cdot 5 \cdot 19}{8 \cdot 16 \cdot 20} = \frac{1805}{2560} = \frac{361}{512}\)