\[\mathbf{Страница\ 19.}\]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\ 7\% = \frac{7}{100}\]
\[\textbf{б)}\ 85\% = \frac{85}{100} = \frac{17}{20}\]
\[\textbf{в)}\ 156\% = \frac{156}{100} = \frac{39}{25}\]
\[\textbf{г)}\ \frac{7}{10}\% = \frac{7}{1000}\]
\[\boxed{\mathbf{3.}}\]
\[\textbf{а)}\ \frac{74}{100} = 74\%\]
\[\textbf{б)}\ \frac{37}{100} = 37\%\]
\[\textbf{в)}\ \frac{49}{100} = 49\%\]
\[\textbf{г)}\ 3\frac{1}{4} = 3\frac{25}{100} = 325\%\]
\[\textbf{д)}\ 45\frac{3}{5} = 45\frac{60}{100} = 4560\%\]
\[\textbf{е)}\ \frac{16}{100} = 16\%\]
\[\boxed{\mathbf{4.}}\]
\[\boxed{\mathbf{5.}}\]
\[\boxed{\mathbf{6.}}\]
\[\frac{8}{20} = \frac{40}{100} = 40\%.\]
\[\frac{6}{100} = 6\%.\]