Решите уравнение:
1) $\frac{52}{63} - \frac{x}{63} = \frac{25}{63}$;
2) $\frac{x}{38} + \frac{14}{38} = \frac{23}{38}$;
3) $(\frac{12}{13} + x) - \frac{5}{13} = \frac{9}{13}$;
4) $(x - \frac{21}{31}) + \frac{14}{31} = \frac{25}{31}$.
$\frac{52}{63} - \frac{x}{63} = \frac{25}{63}$
$-\frac{x}{63} = \frac{25}{63} - \frac{52}{63}$
$-\frac{x}{63} = -\frac{27}{63}$
$\frac{x}{63} = \frac{27}{63}$
x = 27
$\frac{x}{38} + \frac{14}{38} = \frac{23}{38}$
$\frac{x}{38} = \frac{23}{38} - \frac{14}{38}$
$\frac{x}{38} = \frac{9}{38}$
x = 9
$(\frac{12}{13} + x) - \frac{5}{13} = \frac{9}{13}$
$\frac{12}{13} + x - \frac{5}{13} = \frac{9}{13}$
$x = \frac{9}{13} + \frac{5}{13} - \frac{12}{13}$
$x = \frac{2}{13}$
$(x - \frac{21}{31}) + \frac{14}{31} = \frac{25}{31}$
$x - \frac{21}{31} + \frac{14}{31} = \frac{25}{31}$
$x = \frac{25}{31} + \frac{21}{31} - \frac{14}{31}$
$x = \frac{32}{31}$
Пожауйста, оцените решение