Решебник по математике 5 класс Мерзляк ФГОС Задание 752

 

\[\boxed{\mathbf{752\ (752)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ \frac{x}{72} - \frac{13}{72} = \frac{29}{72}\]

\[x - 13 = 29\]

\[x = 29 + 13\]

\[x = 42\]

\[Ответ:42.\]

\[2)\ \left( \frac{29}{42} - a \right) - \frac{13}{42} = \frac{11}{42}\]

\[\frac{29}{42} - a = \frac{11}{42} + \frac{13}{42}\]

\[a = \frac{29}{42} - \frac{24}{42}\]

\[a = \frac{5}{42}\]

\[Ответ:\frac{5}{42}.\]

\[3)\ \frac{15}{17} - \left( b - \frac{3}{17} \right) = \frac{6}{17}\]

\[b - \frac{3}{17} = \frac{15}{17} - \frac{6}{17}\]

\[b = \frac{9}{17} + \frac{3}{17}\]

\[b = \frac{12}{17}\]

\[Ответ:\frac{12}{17}.\]

\[4)\ \frac{29}{43} - \left( m + \frac{13}{43} \right) = \frac{5}{43}\]

\[m + \frac{13}{43} = \frac{29}{43} - \frac{5}{43}\]

\[m = \frac{24}{43} - \frac{13}{43}\]

\[m = \frac{11}{43}\]

\[Ответ:\frac{11}{43}.\]

\[\boxed{\mathbf{752}.}\]

\[S = 12 \cdot 5 \cdot 5 = 60 \cdot 5 =\]

\[= 300\ мм^{2} = 3\ см^{2}.\]