Реши примеры: 1) \frac{19}{28} + \frac{16}{28} - \frac{17}{28}

Конечно, давай решим эти примеры вместе! 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) $4\frac{5}{9} - 2\frac{8}{9} = 3\frac{14}{9} - 2\frac{8}{9} = (3 - 2) + (\frac{14}{9} - \frac{8}{9}) = 1 + \frac{6}{9} = 1\frac{2}{3}$ 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) $\frac{13}{8} : 4 = \frac{13}{8} \cdot \frac{1}{4} = \frac{13}{32}$ 7) $2\frac{3}{8} \cdot 3\frac{1}{5} : \frac{19}{20} = \frac{19}{8} \cdot \frac{16}{5} : \frac{19}{20} = \frac{19 \cdot 16 \cdot 20}{8 \cdot 5 \cdot 19} = \frac{16 \cdot 20}{8 \cdot 5} = \frac{2 \cdot 4}{1 \cdot 1} = 8$ **Ответы:** 1) $\frac{9}{14}$ 2) $3\frac{9}{14}$ 3) $\frac{9}{17}$ 4) $1\frac{2}{3}$ 5) $11\frac{2}{3}$ 6) $\frac{13}{32}$ 7) $8$