\[\boxed{\mathbf{954\ (944).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ a > 0 \Longrightarrow a > - a\ \ \ \ \]
\[a < 0 \Longrightarrow a < - a\ \ \]
\[\ a = 0 \Longrightarrow a = - a\]
\[2)\ a \geq 0 \Longrightarrow |a| = a\ \ \ \ \]
\[a < 0\ \Longrightarrow |a| > a \Longrightarrow |a| \geq a\]
\[3)\ a > 0\ \Longrightarrow |a| > - a\ \ \ \ \]
\[a \leq 0\ \Longrightarrow |a| = - a \Longrightarrow |a| \geq - a\]