\[\boxed{\text{148\ (148).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = x^{4}\]
\[\textbf{а)}\ y = 5:\ \ \ \]
\[x_{1} = - 1,5;\ \ \ x_{2} = 1,5;\]
\[\textbf{б)}\ y = 3,5:\ \ \]
\[x_{1} = - 1,4;\ \ \ x_{2} = 1,4;\]
\[\textbf{в)}\ y = 8:\ \ \ \]
\[x_{1} = - 1,7;\ \ \ x_{2} = 1,7.\]