\[\boxed{\text{7.40.}}\]
\[\textbf{а)}\ \frac{800}{800} = 1\]
\[\textbf{б)}\ \frac{1000}{800} = \frac{10}{8} = \frac{5}{4}\]
\[\textbf{в)}\ \frac{8}{800} = \frac{1}{100}\]
\[\textbf{г)}\ \frac{80}{800} = \frac{1}{10}\]
\[\textbf{д)}\ \frac{160}{800} = \frac{1}{5}\]
\[\textbf{е)}\ \frac{800}{800} = 1\]
\[\textbf{ж)}\ \frac{1200}{800} = \frac{12}{8} = \frac{3}{2}\]