1.若f(x)=x^2-ax+1有负值,则常数a的取值范围为( )A.(-∞,-2)∪(2,+∞) B.(-2,2) C.(-∞,-2】∪【2,+∞) D.【-2,2】2.已知a+b+c=0且a>b>c,下列不等式恒成立的是( )A.ab>bc B.ac>bc C.ab>ac D.a|b|>c|b|3.已知
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![1.若f(x)=x^2-ax+1有负值,则常数a的取值范围为( )A.(-∞,-2)∪(2,+∞) B.(-2,2) C.(-∞,-2】∪【2,+∞) D.【-2,2】2.已知a+b+c=0且a>b>c,下列不等式恒成立的是( )A.ab>bc B.ac>bc C.ab>ac D.a|b|>c|b|3.已知](/uploads/image/z/8981652-12-2.jpg?t=1.%E8%8B%A5f%28x%29%3Dx%5E2-ax%2B1%E6%9C%89%E8%B4%9F%E5%80%BC%2C%E5%88%99%E5%B8%B8%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E4%B8%BA%EF%BC%88+%EF%BC%89A.%28-%E2%88%9E%2C-2%29%E2%88%AA%EF%BC%882%2C%2B%E2%88%9E%EF%BC%89+B.%EF%BC%88-2%2C2%EF%BC%89+C.%EF%BC%88-%E2%88%9E%2C-2%E3%80%91%E2%88%AA%E3%80%902%2C%2B%E2%88%9E%EF%BC%89+D.%E3%80%90-2%2C2%E3%80%912.%E5%B7%B2%E7%9F%A5a%2Bb%2Bc%3D0%E4%B8%94a%3Eb%3Ec%2C%E4%B8%8B%E5%88%97%E4%B8%8D%E7%AD%89%E5%BC%8F%E6%81%92%E6%88%90%E7%AB%8B%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A.ab%3Ebc+B.ac%3Ebc+C.ab%3Eac+D.a%7Cb%7C%3Ec%7Cb%7C3.%E5%B7%B2%E7%9F%A5)
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