\[Страница\ 51.\]
\[\boxed{\mathbf{10.}}\]
\[\textbf{а)}\frac{7}{10} - \frac{1^{\backslash 2}}{5} = \frac{7}{10} - \frac{2}{10} = \frac{5}{10} =\]
\[= \frac{1}{2}\ м.\]
\[Ответ:\frac{1}{2}\ м.\]
\[\textbf{б)}\frac{2^{\backslash 4}}{5} + \frac{3^{\backslash 5}}{4} = \frac{8}{20} + \frac{15}{20} = \frac{23}{20} =\]
\[= 1\frac{3}{20}\ кг.\]
\[Ответ:1\frac{3}{20}\ кг.\]
\[\textbf{в)}\frac{2^{\backslash 5}}{3} + \frac{1^{\backslash 3}}{5} = \frac{10}{15} + \frac{3}{15} = \frac{13}{15}\ г.\]
\[Ответ:\frac{13}{15}\ г.\]
\[\textbf{г)}\frac{1^{\backslash 3}}{6} + \frac{1^{\backslash 2}}{9} = \frac{3}{18} + \frac{2}{18} = \frac{5}{18}\]
\[Ответ:\frac{5}{18}.\]