\[\boxed{\mathbf{1353}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ a + b > a\]
\[при\ b > 0;a < 0;\ \ |b| > |a|.\]
\[2)\ a + b < a\]
\[при\ a > 0;\ \ b < 0.\]
\[3)\ a + b = a\]
\[при\ b = 0.\]
\[4)\ a + b = 0\]
\[при\ a = - b;\ \ b = - a.\]