Вычислите: -19/42+(-9/16)+(-11/42)+5/16.

\[- \frac{19}{42} + \left( - \frac{9}{16} \right) + \left( - \frac{11}{42} \right) + \frac{5}{16} =\]

\[= - \left( \frac{19}{42} + \frac{11}{42} \right) - \left( \frac{9}{16} - \frac{5}{16} \right) =\]

\[= - \frac{30}{42} - \frac{4}{16} = - \frac{5}{7} - \frac{1}{4} =\]

\[= - \frac{20 + 7}{28} = - \frac{27}{28}\]