Question

Tìm x,y biết: (x - 2021)² + (y + 2022)² = 0

Answer 1

<=> x-2021=0 và y+2022=0

=>x=2021 và y=-2022

Answer 2

Vì \(\left(x-2021\right)^2\ge0,\left(y+2022\right)^2\ge0\)

\(\Rightarrow\left(x-2021\right)^2+\left(y+2022\right)^2\ge0\)

Dấu "=" xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}x-2021=0\\y+2022=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2021\\y=-2022\end{matrix}\right.\)

Vậy \(\left(x,y\right)=\left(2021,-2022\right)\)