\[\boxed{\mathbf{Проверочная\ работа\ №3.\ Отношения\ }}\]
\[\boxed{\mathbf{1.}}\]
\[12\ :14 = \frac{12}{14} = \frac{6}{7}\ (часть).\]
\[\boxed{\mathbf{2.}}\]
\[4\ :20 = \frac{4}{20} = \frac{2}{10} =\]
\[= 0,2\ или\ 20\%.\]
\[\boxed{\mathbf{3.}}\]
\[1\ мин = 60\ с.\]
\[6\ :60 = \frac{6}{60} = \frac{1}{10} =\]
\[= 0,1\ или\ 10\%.\]
\[\boxed{\mathbf{4.}}\]
\[8\ :3 = \frac{8}{3} = 2\frac{2}{3}\ (раза).\]
\[\boxed{\mathbf{5.}}\]
\[\frac{2}{3}\ части.\]
\[\boxed{\mathbf{6.}}\]
\[\frac{1}{2}\ :\frac{1}{3} = \frac{1}{2} \cdot 3 = \frac{3}{2} = 1,5\ (раза).\]
\[\boxed{\mathbf{7.}}\]
\[\frac{a}{b}\ :\frac{b}{a} = \frac{a}{b} \cdot \frac{a}{b} \neq 1\]
\[\mathbf{Нет.}\]
\[\boxed{\mathbf{8.}}\]
\[\mathbf{Да.}\]