若a > 0，b > 0及 c < 0，下列何者可表示 y = a x ^2+ b x + c 的圖像

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Date Uploaded: 04/20/2016

Tags: 若a > 0，b > 0及 c < 0，下列何者可表示 y = a x ^2+ b x + c 的圖像  

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