1.
a. $
C = x^2 + |y - 2| - 2017 \\ x^2 \geq 0; |y - 2| \geq 0\\ \Rightarrow x^2 + |y - 2| \geq 0 \\ \Rightarrow C = x^2 + |y - 2| - 2017 \geq -2017 \\ Dấu\; "="\; xảy\; ra\; khi \\ \left\{\begin{matrix}
x^2 = 0\\
|y - 2| = 0
\end{matrix}\right.\\ \Leftrightarrow \left\{\begin{matrix}
x = 0\\...