\[\boxed{\text{105.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ f(x) = \frac{5}{x}\]
\[f( - x) = \frac{5}{- x} = - \frac{5}{x} = - f(x)\]
\[функция\ нечетная.\]
\[\textbf{б)}\ f(x) = 5 - 3x^{2}\]
\[f( - x) = 5 - 3x^{2} = f(x)\]
\[функция\ четная.\]
\[\textbf{в)}\ f(x) = x^{3} - x\]
\[f( - x) = - x^{3} + x =\]
\[= - \left( x^{3} - x \right) = - f(x)\]
\[функция\ нечетная.\]
\[\textbf{г)}\ f(x) = 1 - |x| = 1 - x\]
\[f( - x) = 1 - | - x| = 1 - x =\]
\[= f(x)\]
\[функция\ четная.\]