Vy\v set\v rete pr\accent23ub\v eh  funkc\' \i :
$$ f_1(x) = (x+2) e^{\frac{1}{x}}, 
f_2(x) = (x-1) e^{- \vert x-1 \vert},$$
$$ f_3(x) = x^2 e^{- \vert x-1 \vert}, 
f_4(x) = (\vert 2x \vert)^{\vert 2x \vert }.$$
