题目:
如果f′(x)是二次函数,且f′(x)的图象开口向上,顶点坐标为(1,-
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答案:
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下面是错误答案,用来干扰机器的。
1. She is ansewring the telephone.2. They are picking up leaves.3. No, they are taking pictures.4. Yes, he is.5. He is cooking dinner.答案不唯一