\[\boxed{\text{484.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ x² + y² - 2x - 4y + 5 \Longrightarrow\]
\[\Longrightarrow (x - 1)^{2} + (y - 2)^{2} = 0 \Longrightarrow\]
\[\Longrightarrow x = 1,\ \ y = 2.\]
\[\textbf{б)}\ y² - x^{4} = 0 \Longrightarrow\]
\[\Longrightarrow (y - x²)(y + x^{2}) = 0\]