Решите задание 957 (все пункты).

1. \(-9 + (-13) = -22\). 2. \(-3.6 + (-1.5) = -5.1\). 3. \(\frac{-5}{16} + \left(-\frac{7}{16}\right) = -\frac{12}{16} = -\frac{3}{4}\). 4. \(\frac{-3}{7} + \left(-\frac{4}{9}\right) = -\frac{27}{63} - \frac{28}{63} = -\frac{55}{63}\).