2) Вычислим значение выражения:
$$(4\frac{2}{5}:1\frac{3}{5}+2\frac{4}{7}-8\frac{1}{2}:14):(2\frac{3}{8}-1\frac{11}{14})$$
$$\frac{22}{5} : \frac{8}{5} = \frac{22}{5} \cdot \frac{5}{8} = \frac{22 \cdot 5}{5 \cdot 8} = \frac{11}{4}$$
$$\frac{17}{2} : 14 = \frac{17}{2} : \frac{14}{1} = \frac{17}{2} \cdot \frac{1}{14} = \frac{17}{28}$$
$$\frac{11}{4} + \frac{18}{7} = \frac{11 \cdot 7 + 18 \cdot 4}{28} = \frac{77 + 72}{28} = \frac{149}{28}$$
$$\frac{149}{28} - \frac{17}{28} = \frac{149 - 17}{28} = \frac{132}{28} = \frac{33}{7}$$
$$\frac{19}{8} - \frac{25}{14} = \frac{19 \cdot 7 - 25 \cdot 4}{56} = \frac{133 - 100}{56} = \frac{33}{56}$$
$$\frac{33}{7} : \frac{33}{56} = \frac{33}{7} \cdot \frac{56}{33} = \frac{33 \cdot 56}{7 \cdot 33} = \frac{1 \cdot 8}{1 \cdot 1} = 8$$
Ответ: 8