\[Стр.\ 9.\]
\[\boxed{\mathbf{7.}}\]
\[A\left( \frac{2}{16} \right);\]
\[B\left( \frac{8}{16} \right);\]
\[C\left( \frac{12}{16} \right);\]
\[D\left( \frac{5}{16} \right).\]
\[\boxed{\mathbf{8.}}\]
\[\textbf{а)}\ \frac{3}{8} = 1,5\ см.\]
\[\textbf{б)}\ \frac{7}{8} = 3,5\ см.\]
\[\textbf{в)}\ \frac{1}{4} = 1\ см.\]
\[\textbf{г)}\ \frac{1}{2} = 2\ см.\]
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)}\ 1\ см = \frac{1}{10}\ дм\]
\[1\ ц = \frac{1}{10}\ т\]
\[1\ кг = \frac{1}{1000}\ т\]
\[1\ коп. = \frac{1}{100}\ р.\]
\[\textbf{б)}\ 5\ ц = \frac{5}{10}\ т\]
\[38\ м = \frac{38}{1000}\ км\]
\[8\ мм = \frac{8}{10}\ см\]
\[5\ мин = \frac{5}{60}\ ч\]
\[\boxed{\mathbf{10.}}\]
\[\textbf{а)}\ \frac{3}{10}\ м = 30\ см\]
\[\frac{3}{5}\ м = 60\ см\]
\[\frac{1}{2}\ м = 50\ см\]
\[\frac{3}{4}\ м = 75\ см\]
\[\textbf{б)}\ \frac{1}{2}\ т = 500\ кг\]
\[\frac{3}{4}\ кг = 750\ г\]
\[\frac{1}{4}\ т = 2,5\ ц\]
\[\frac{3}{4}\ ц = 75\ кг\]
\[\textbf{в)}\ \frac{1}{8}\ суток = 3\ часа\]
\[\frac{1}{3}\ ч = 20\ мин\]
\[\frac{1}{4}\ мин = 15\ с\]
\[\frac{3}{4}\ ч = 45\ мин\]
\[\textbf{г)}\ \frac{1}{4}\ р. = 25\ к.\]
\[\frac{3}{4}\ р. = 75\ к.\]
\[\frac{2}{5}\ р. = 40\ к.\]
\[\frac{7}{10}\ р. = 70\ к.\]