\[\boxed{\text{519\ (519).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ x² + y² - 2x - 4y + 5 \Longrightarrow\]
\[\Longrightarrow (x - 1)^{2} + (y - 2)^{2} = 0 \Longrightarrow\]
\[\Longrightarrow x = 1,\ \ y = 2.\]
\[\textbf{б)}\ y² - x^{4} = 0 \Longrightarrow\]
\[\Longrightarrow (y - x²)(y + x^{2}) = 0\]
\[\boxed{\text{519.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ y \geq |x|\]
\[\textbf{б)}\ y \leq |x - 2|\]