\[\boxed{\mathbf{826\ (826)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 2\frac{1}{3} \cdot 2 = \frac{7}{3} \cdot \frac{2}{1} = \frac{7 \cdot 2}{3 \cdot 1} = \frac{14}{3} = 4\frac{2}{3}\]
\[\textbf{б)}\ 4 \cdot 1\frac{1}{2} = \frac{4}{1} \cdot \frac{3}{2} = \frac{4 \cdot 3}{1 \cdot 2} = \frac{6}{1} = 6\]
\[\textbf{в)}\ 1\frac{1}{3} \cdot 9 = \frac{4}{3} \cdot \frac{9}{1} = \frac{4 \cdot 9}{3 \cdot 1} = \frac{12}{1} = 12\]
\[\textbf{г)}\frac{3}{7} \cdot 2\frac{1}{3} = \frac{3}{7} \cdot \frac{7}{3} = \frac{3 \cdot 7}{7 \cdot 3} = 1\]
\[\textbf{д)}\frac{7}{8} \cdot 5\frac{1}{3} = \frac{7}{8} \cdot \frac{16}{3} = \frac{7 \cdot 16}{8 \cdot 3} = \frac{14}{3} = 4\frac{2}{3}\]