\[\boxed{\mathbf{Проверочная\ работа\ №2.\ Отношения\ }}\]
\[\boxed{\mathbf{1.}}\]
\[8\ :3 = \frac{8}{3} \rightarrow \frac{3}{8}.\]
\[\boxed{\mathbf{2.}}\]
\[10\ :90 = \frac{10}{90} = \frac{1}{9} \rightarrow 9.\]
\[\boxed{\mathbf{3.}}\]
\[50\ :30 = \frac{5}{3} = 1\frac{2}{3}.\]
\[\boxed{\mathbf{4.}}\]
\[3\ л = 3\ дм^{3}.\]
\[3\ :10 = \frac{3}{10} = 0,3.\]
\[\boxed{\mathbf{5.}}\]
\[1\ т = 1000\ кг.\]
\[200\ :1000 = \frac{2}{10} = \frac{1}{5} = 0,2.\]
\[\boxed{\mathbf{6.}}\]
\[1\ ч = 60\ мин.\]
\[15\ :60 = \frac{15}{60} = \frac{1}{4} = 0,25.\]
\[\boxed{\mathbf{7.}}\]
\[50\% \rightarrow 0,5 = \frac{1}{2}.\]
\[2\ :\frac{1}{2} = 2 \cdot 2 = 4\]
\[Да.\]
\[\boxed{\mathbf{8.}}\]
\[0,2 = \frac{2}{10} = \frac{1}{5} \rightarrow 5\]
\[Да.\]