\[Страница\ 112.\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\ 4\frac{2}{7}\ :53\frac{1}{3} = \frac{30}{7} \cdot \frac{3}{160} = \frac{9}{112}\]
\[22,5\ :280 = \frac{225}{10 \cdot 280} = \frac{9}{112}\]
\[4\frac{2}{7}\ :53\frac{1}{3} = 22,5\ :280\]
\[\textbf{б)}\ 67,5\ :11,25 = 6\]
\[200\ :33\frac{1}{3} = \frac{200 \cdot 3}{1 \cdot 100} = 6\]
\[67,5\ :11,25 = 200\ :33\frac{1}{3}\]
\[\boxed{\mathbf{6.}}\]
\[\textbf{а)}\ средние\ члены:\ \ 6\ и\ 56\]
\[их\ произведение:\ 336\]
\[крайние\ члены:\ 48\ и\ 7\]
\[их\ произведение:\ 336.\]
\[\textbf{б)}\ средние\ члены:\ 0,5\ и\ 3,8\]
\[их\ произведение:\ 1,9\]
\[крайние\ члены:\ 0,2\ и\ 9,5\ \]
\[их\ произвеление:\ 1,9.\]