Вопрос:

Ответ:

\[b = |5 + a|\]

\[a = - 5:\]

\[b = \left| 5 + ( - 5) \right| = |5 - 5| = |0| = 0.\]

\[a = 0:\]

\[b = |5 + 0| = |5| = 5.\]

\[a = 4:\]

\[b = |5 + 4| = |9| = 9.\]