ГДЗ по математике 5 класс Мерзляк Задание 751

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\[1)\ \frac{52}{63} - \frac{x}{63} = \frac{25}{63}\]

\[52 - x = 25\]

\[x = 52 - 25\]

\[x = 27\]

\[Ответ:27.\]

\[2)\ \frac{x}{38} + \frac{14}{38} = \frac{23}{38}\]

\[x + 14 = 23\]

\[x = 23 - 14\]

\[x = 9\]

\[Ответ:9.\]

\[3)\ \left( \frac{12}{13} + x \right) - \frac{5}{13} = \frac{9}{13}\]

\[\frac{12}{13} + x = \frac{9}{13} + \frac{5}{13}\]

\[x = \frac{14}{13} - \frac{12}{13}\]

\[x = \frac{2}{13}\]

\[Ответ:\frac{2}{13}.\]

\[4)\ \left( x - \frac{21}{31} \right) + \frac{14}{31} = \frac{25}{31}\]

\[x - \frac{21}{31} = \frac{25}{31} - \frac{14}{31}\]

\[x = \frac{11}{31} + \frac{21}{31}\]

\[x = \frac{32}{31}\]

\[Ответ:\frac{32}{31}.\]