Вопрос:

Ответ:

\[b = |a| - 4\]

\[a = - 5:\]

\[b = | - 5| - 4 = 5 - 4 = 1.\]

\[a = 0:\]

\[b = |0| - 4 = 0 - 4 = - 4.\]

\[a = 4:\]

\[b = |4| - 4 = 4 - 4 = 0.\]