Решебник по математике 5 класс Мерзляк ФГОС Задание 743

\[\boxed{\mathbf{743\ (743)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ \frac{7}{18} + \frac{5}{18} = \frac{7 + 5}{18} = \frac{12}{18}\]

\[2)\ \frac{11}{24} + \frac{8}{24} = \frac{11 + 8}{24} = \frac{19}{24}\]

\[3)\ \frac{23}{47} - \frac{11}{47} = \frac{23 - 14}{47} = \frac{9}{47}\]

\[4)\ \frac{31}{58} - \frac{16}{58} = \frac{31 - 16}{58} = \frac{15}{58}\]

\[5)\ \frac{3}{29} + \frac{6}{29} - \frac{8}{29} = \frac{3 + 6 - 8}{29} =\]

\[= \frac{1}{29}\]

\[6)\ \frac{29}{64} - \frac{14}{64} - \frac{9}{64} =\]

\[= \frac{29 - 14 - 9}{64} = \frac{6}{64}\]

\[\boxed{\mathbf{743}\mathbf{\ (571)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[P_{кв} = 96\ см.\]

\[P_{кв} = 4a = 96 \Longrightarrow a = 96\ :4 =\]

\[= 24\ см.\]

\[S_{кв} = a^{2} = 24^{2} = 576\ см^{2}.\]

\[Ответ:\ \ 576\ см^{2}.\ \]