\(\Delta ABC\)中，\(\overline{AB}=5\),\(\overline{AC}=5\),\(\overline{BC}=8\)，\(G\)為重心，\(I\)是內心，\(O\)是外心，若\( \vec{BO}=x \vec{BG}+y \vec{BI} \)求數對\((x,y)\)？
答案：\( \displaystyle (\frac{15}{2},-\frac{13}{2}) \)

謝謝weiye老師與eyeready老師的解說,我明白了!