\[\boxed{\mathbf{353\ (353).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
Пояснение.
Решение.
\[= 15 + 5 - 3 = 17\]
\[2)\ 48 \cdot \left( \frac{19}{24} - \frac{7}{12} + \frac{3}{8} \right) =\]
\[= 48 \cdot \frac{19}{24} - 48 \cdot \frac{7}{12} + 48 \cdot \frac{3}{8} =\]
\[4)\ \left( \frac{15}{16} - \frac{5}{12} + 2\frac{1}{2} \right) \cdot \frac{4}{5} =\]
\[= \frac{15}{16} \cdot \frac{4}{5} - \frac{5}{12} \cdot \frac{4}{5} + \frac{5}{2} \cdot \frac{4}{5} =\]
\[= \frac{9 - 4 + 24}{12} = \frac{29}{12} = 2\frac{5}{12}\]
\[\boxed{\mathbf{353}\mathbf{.}}\]
\[1)\ 28 \cdot \frac{1}{2} = 14\]
\[2)\ 28 \cdot \frac{3}{7} = 4 \cdot 3 = 12\]
\[3)\ 28 \cdot \frac{9}{14} = 2 \cdot 9 = 18\]
\[4)\ 28 \cdot \frac{19}{28} = 1 \cdot 19 = 19\]