試比較下列各二次函數，將圖形開口由大到小排列： (A) 乙＞甲＞丁＞丙 (B) 丙＞乙＞甲＞丁 (C) 乙＞丁＞甲＞丙 (D) 甲＞乙＞丙＞丁

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試比較下列各二次函數，將圖形開口由大到小排列：
(A) 乙＞甲＞丁＞丙
(B) 丙＞乙＞甲＞丁
(C) 乙＞丁＞甲＞丙
(D) 甲＞乙＞丙＞丁

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