\[\boxed{\mathbf{967\ (}\mathbf{н}\mathbf{).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1) - 9 + ( - 13) = - 22\]
\[2) - 3,6 + ( - 1,5) = - 5,1\]
\[3)\ - \frac{3}{7} + \left( - \frac{4}{9} \right) = - \frac{27}{63} +\]
\[+ \left( - \frac{28}{63} \right) = - \frac{55}{63}\]