\(\left[ \begin{array}{l}x-28=1/2\\y+28=1/2\end{array} \right.\) ⇔\(\left[ \begin{array}{l}x=57/2\\y=-55/2\end{array} \right.\) Bình luận
\(\left[ \begin{array}{l}x-28=1/2\\y+28=1/2\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=57/2\\y=-55/2\end{array} \right.\)