\[\boxed{\mathbf{91}\mathbf{8}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ a > 2\ \ \ \ \ | \cdot a\]
\[a^{2} > 2a.\]
\[2)\ b < - 1;\ \ \ b < 0\]
\[b < - 1\ \ \ \ | \cdot ( - b)\]
\[b^{2} > b.\]
\[3)\ m < - 3;\ \ \ \ m < 0\]
\[( - m)^{2} < ( - 3) \cdot m\]
\[m^{2} > 3m\]
\[m^{2} < - 3m.\]
\[4)\ c^{2} > - 4c \Longrightarrow если\ c > 0;\ \ \]
\[если\ - 4 < c < 0 \Longrightarrow \ c^{2} < - 4c.\ \]