\[\boxed{\mathbf{3.41}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
Решение.
\[\textbf{а)}\ 2\frac{1}{3}\ :1\frac{1}{2} = 28\ :18\]
\[28 \cdot 1\frac{1}{2} = 28 \cdot \frac{3}{2} = 14 \cdot 3 = 42\]
\[2\frac{1}{3} \cdot 18 = \frac{7}{3} \cdot 18 = 7 \cdot 6 = 42\]
\[42 = 42 \rightarrow верно.\]
\[\textbf{б)}\ 10,5\ :7 = 5\frac{1}{4}\ :3\frac{1}{2}\]
\[7 \cdot 5\frac{1}{4} = 7 \cdot \frac{21}{4} = \frac{147}{4} = 36\frac{3}{4}\]
\[10,5 \cdot 3\frac{1}{2} = \frac{105}{10} \cdot \frac{7}{2} = \frac{21}{2} \cdot \frac{7}{2} =\]
\[= \frac{147}{4} = 36\frac{3}{4}\]
\[36\frac{3}{4} = 36\frac{3}{4} \rightarrow верно.\]
\[\textbf{в)}\ 3\frac{1}{5}\ :8 = 1\ :32\]
\[8 \cdot 1 = 8\]
\[3\frac{1}{5} \cdot 32 = \frac{16}{5} \cdot 32 = 102,4\]
\[8 \neq 102,4 \rightarrow неверно.\]
\[\textbf{г)}\ \frac{0,43}{0,9} = \frac{0,131}{0,27}\]
\[0,43 \cdot 0,27 = 0,1161\]
\[0,9 \cdot 0,131 = 0,1179\]
\[Неверно.\]
\[\textbf{д)}\ \frac{32}{4} = \frac{56}{7}\]
\[8 = 8\]
\[Верно.\]
\[\textbf{е)}\ \frac{17}{1,4} = \frac{2,4}{0,07}\]
\[17 \cdot 0,07 = 1,19\]
\[2,4 \cdot 1,4 = 3,36\]
\[Неверно.\ \]