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МатематикаРешебник по математике 5 класс Мерзляк ФГОС Задание 921
Задание 921
\[\boxed{\ \mathbf{921\ (921)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[23,75\ м \cdot 10,92\ м = 259,35\ м^{2} \approx\]
\[\approx 259\ (м^{2}) - площадь\ корта.\]
\[Ответ:259\ м^{2}.\]
\[\boxed{\mathbf{921}.\ }\]
\[1)\ 6\frac{4}{9} + 3\frac{5}{9} =\]
\[= (6 + 3) + \left( \frac{4}{9} + \frac{5}{9} \right) = 9 + \frac{9}{9} =\]
\[= 9 + 1 = 10\]
\[2)\ 10\frac{11}{19} + 5\frac{14}{19} =\]
\[= (10 + 5) + \left( \frac{11}{19} + \frac{14}{19} \right) =\]
\[= 15 + \frac{25}{19} = 15 + 1\frac{6}{19} = 16\frac{6}{19}\]
\[3)\ 2\frac{3}{13} + 2\frac{11}{13} =\]
\[= (2 + 2) + \left( \frac{3}{13} + \frac{11}{13} \right) =\]
\[= 4 + \frac{14}{13} = 4 + 1\frac{1}{13} = 5\frac{1}{13}\]
\[4)\ 1\frac{5}{8} + 3\frac{7}{8} =\]
\[= (1 + 3) + \left( \frac{5}{8} + \frac{7}{8} \right) = 4 + \frac{12}{8} =\]
\[= 4 + 1\frac{4}{8} = 5\frac{4}{8}\]
\[5)\ 1 - \frac{3}{11} = \frac{11}{11} - \frac{3}{11} = \frac{11 - 3}{11} =\]
\[= \frac{8}{11}\]
\[6)\ 1 - \frac{13}{40} = \frac{40}{40} - \frac{13}{40} =\]
\[= \frac{40 - 13}{40} = \frac{27}{40}\]
\[7)\ 4 - 1\frac{4}{7} = 3\frac{7}{7} - 1\frac{4}{7} =\]
\[= (3 - 1) + \left( \frac{7}{7} - \frac{4}{7} \right) = 2 + \frac{3}{7} =\]
\[= 2\frac{3}{7}\]
\[8)\ 10 - 9\frac{3}{10} = 9\frac{10}{10} - 9\frac{3}{10} =\]
\[= (9 - 9) + \left( \frac{10}{10} - \frac{3}{10} \right) =\]
\[= 0 + \frac{7}{10} = \frac{7}{10}\]
\[9)\ 5\frac{2}{7} - 2\frac{5}{7} = 4\frac{9}{7} - 2\frac{5}{7} =\]
\[= (4 - 2) + \left( \frac{9}{7} - \frac{5}{7} \right) = 2 + \frac{4}{7} =\]
\[= 2\frac{4}{7}\]
\[10)\ 14\frac{6}{20} - 8\frac{12}{20} =\]
\[= 13\frac{26}{20} - 8\frac{12}{20} =\]
\[= (13 - 8) + \left( \frac{26}{20} - \frac{12}{20} \right) =\]
\[= 5 + \frac{14}{20} = 5\frac{14}{20}\]
\[11)\ 8\frac{3}{14} - 5\frac{9}{14} = 7\frac{17}{14} - 5\frac{9}{14} =\]
\[= (7 - 5) + \left( \frac{17}{14} - \frac{9}{14} \right) =\]
\[= 2 + \frac{8}{14} = 2\frac{8}{14}\]
\[12)\ 14\frac{8}{31} - 6\frac{8}{31} =\]
\[= (14 - 6) + \left( \frac{8}{31} - \frac{8}{31} \right) =\]
\[= 8 + 0 = 8\]
