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這個題有兩個情况一個是AB為底(上底下底不用管)這是中位線肯定平行於AB也就是說中位線是豎直的斜率為0又要過AC中點所以直線為x=2 另一個是以AC為底斜率為AC的斜率(中位線平行上下底~) 斜率是根下20(沒仔細算) 還要過AB中點(-2,2)然後方程就出來了
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