\[\boxed{\mathbf{211.}}\]
\[\textbf{а)}\ 3 < x \leq 5;\ \ 4 < x \leq 8\]
\[3 < x \leq 8.\]
\[\textbf{б)}\ x > 2;\ \ x < - 1;\]
\[- 1 < x < 2.\]
\[\textbf{в)}\ x \geq 6;\ \ x \leq 9;\]
\[- \infty < x < + \infty.\]
\[\textbf{г)}\ 5 \leq x < 7;\ \ x > 4.\]
\[x > 4.\]