\(\left\{{}\begin{matrix}x=5-y\\y\left(5-y\right)=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x=1\\y=4\end{matrix}\right.\\\left\{{}\begin{matrix}x=4\\y=1\end{matrix}\right.\end{matrix}\right.\)
Đúng 0
Bình luận (0)
