\[\boxed{\mathbf{2.2}\mathbf{79}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
Решение.
\[\textbf{а)}\ 1\frac{1}{3} \cdot 1\frac{2}{5} = \frac{4}{3} \cdot \frac{7}{5} = \frac{4 \cdot 7}{3 \cdot 5} =\]
\[= \frac{28}{15} = 1\frac{13}{15}\]
\[\textbf{б)}\ 2\frac{4}{9} \cdot 3\frac{3}{11} = \frac{22}{9} \cdot \frac{36}{11} =\]
\[= \frac{22 \cdot 36}{9 \cdot 11} = 2 \cdot 4 = 8\ \]
\[\textbf{в)}\ 1\frac{1}{8} \cdot 1\frac{7}{9} = \frac{9}{8} \cdot \frac{16}{9} = \frac{9 \cdot 16}{8 \cdot 9} = 2\]
\[\textbf{г)}\ 1\frac{4}{21} \cdot 4\frac{1}{5} = \frac{25}{21} \cdot \frac{21}{5} =\]
\[= \frac{25 \cdot 21}{21 \cdot 5} = 5\]
\[\textbf{д)}\ 2\frac{2}{7} \cdot 1\frac{3}{4} = \frac{16}{7} \cdot \frac{7}{4} = \frac{16 \cdot 7}{7 \cdot 4} = 4\]
\[\textbf{е)}\ 1\frac{1}{5} \cdot 1\frac{17}{18} = \frac{6}{5} \cdot \frac{35}{18} = \frac{6 \cdot 35}{5 \cdot 18} =\]
\[= \frac{7}{3} = 2\frac{1}{3}\]