\[\boxed{\mathbf{629\ (629)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \left( 3\frac{1}{3} + 2,5 \right) \cdot \left( 4,6 - 2\frac{1}{3} \right) =\]
\[= \left( \frac{10}{3} + \frac{25}{10} \right) \cdot \left( \frac{46}{10} - \frac{7}{3} \right) =\]
\[= \left( \frac{10^{\backslash 2}}{3} + \frac{5^{\backslash 3}}{2} \right) \cdot \left( \frac{23^{\backslash 3}}{5} - \frac{7^{\backslash 5}}{3} \right) =\]
\[= \frac{20 + 15}{6} \cdot \frac{69 - 35}{15} = \frac{35}{6} \cdot \frac{34}{15} =\]
\[2)\ \left( 4,5 \cdot 1\frac{2}{3} - 6,75 \right) \cdot \left( 1\frac{1}{3} \right)^{3} =\]
\[= \left( \frac{45}{10} \cdot \frac{5}{3} - 6\frac{75}{100} \right) \cdot \left( \frac{4}{3} \right)^{3} =\]
\[\boxed{\mathbf{629.}\mathbf{\ }}\]
\[a\%\ от\ b:\]
\[b \cdot \frac{a}{100} = \frac{\text{ab}}{100}\ \Longrightarrow\]
\[\Longrightarrow b\%\ от\ \ a:\]
\[a \cdot \frac{b}{100} = \frac{\text{ab}}{100} \Longrightarrow\]
\[\Longrightarrow a\%\ от\ \ b = b\%\ от\ a \Longrightarrow\]
\[\Longrightarrow ч.т.д.\]