\[\boxed{\mathbf{80.}}\]
\[\textbf{а)}\ y = 1 - \frac{1}{|x|}\]
\[\textbf{б)}\ y = \frac{1}{|x|} + 2\]
\[\textbf{в)}\ y = 3^{|x|}\]
\[\textbf{г)}\ y = 3^{- |x|}\]