Bài 4:
Ta có:
\(\left(6x+1,8\right)^{2024}\ge0\forall x\\ \left(2,7-3y\right)^{2022}\ge0\forall y\)
Mặt khác: \(\left(6x+1,8\right)^{2024}+\left(2,7-3y\right)^{2022}=0\)
Dấu "=" xảy ra: \(\left\{{}\begin{matrix}6x+1,8=0\\2,7-3y=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-0,3\\y=0,9\end{matrix}\right.\)