Выполните действия:
1) $\frac{9}{44} + \frac{19}{44} - \frac{15}{44}$;
2) $\frac{72}{91} - \frac{8}{91} - \frac{16}{91}$.
$\frac{9}{44} + \frac{19}{44} - \frac{15}{44} = \frac{9 + 19 - 15}{44} = \frac{28 - 15}{44} = \frac{13}{44}$
$\frac{72}{91} - \frac{8}{91} - \frac{16}{91} = \frac{72 - 8 - 16}{91} = \frac{64 - 16}{91} = \frac{48}{91}$