\[\boxed{\text{103.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ f(x) = 6 - 5x^{2} + x^{4}\]
\[f( - x) =\]
\[= 6 - 5 \cdot ( - x)^{2} + ( - x)^{4} =\]
\[= 6 - 5x^{2} + x^{4} = f(x)\]
\[функция\ четная.\]
\[\textbf{б)}\ f(x) = 5|x| = 5x\]
\[f( - x) = 5| - x| = 5x = f(x)\]
\[функция\ четная.\]