Выполните действия:
1) $\frac{10}{53} + \frac{36}{53} - \frac{19}{53}$;
2) $\frac{80}{97} - \frac{15}{97} - \frac{17}{97}$.
$\frac{10}{53} + \frac{36}{53} - \frac{19}{53} = \frac{10 + 36 - 19}{53} = \frac{46 - 19}{53} = \frac{27}{53}$
$\frac{80}{97} - \frac{15}{97} - \frac{17}{97} = \frac{80 - 15 - 17}{97} = \frac{65 - 17}{97} = \frac{48}{97}$