ГДЗ по математике 5 класс Мерзляк ФГОС Задание 886

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

\[52 - x = 25\]

\[x = 52 - 25\]

\[x = 27\]

\[Ответ:27.\]

\[2)\ \left( x - \frac{21}{31} \right) + \frac{14}{31} = \frac{25}{31}\]

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

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

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

\[Ответ:\frac{32}{31}.\]