問題詳情
18.若y＝ax2＋bx＋c的圖形頂點為( 1 , 9 )，且圖形通過 A ( 6 , －13 ) 及B ( k , － 13 ) 兩點，下列敘述何者正確？
(A) 
平行y軸
(B) a＞0
(C)此拋物線的對稱軸為y＝9
(D) k＝－4
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增
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