\[\boxed{\mathbf{212.}}\]
\[\textbf{а)}\ \left( \frac{1}{2} \right)^{4} = \frac{1}{16};\]
\[\textbf{б)}\ \ \left( \frac{1}{2} \right)^{2} + \left( \frac{1}{2} \right)^{3} = \frac{1}{4} + \frac{1}{8} =\]
\[= \frac{2}{8} + \frac{1}{8} = \frac{3}{8};\]
\[\textbf{в)}\ \left( \frac{1}{2} \right)^{2} = \frac{1}{4};\]
\[\textbf{г)}\ 1 - \left( \frac{1}{2} \right)^{3} = 1 - \frac{1}{8} = \frac{7}{8}.\]