Question

Tìm số hữu tỉ x, y biết: \(\left(3x-33\right)^{2008}+\left|y-7\right|^{2009}\le0\)

Answer 1

Ta có: \(\left\{{}\begin{matrix}\left(3x-33\right)^{2008}\ge0\\\left|y-7\right|^{2009}\ge0\end{matrix}\right.\Rightarrow\left(3x-33\right)^{2008}+\left|y-7\right|^{2009}\ge0\)

Mà \(\left(3x-33\right)^{2008}+\left|y-7\right|^{2009}\le0\)

\(\Rightarrow\left\{{}\begin{matrix}\left(3x-33\right)^{2008}=0\\\left|y-7\right|^{2009}=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}3x-33=0\\y-7=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=11\\y=7\end{matrix}\right.\)

Vậy \(x=11;y=7\)