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若不等式x2+xa+1≥0对一切a∈[0,4]成立,则x的取值范围为

发布时间:2021-07-20

A.(-∞,-2-http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821859869.gif]

B.[-2+http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821890869.gif,+∞)

C.(-∞,-2-http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821890866.gif]∪[-2+http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821937866.gif,+∞)

D.[-2-http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821953866.gif,-2+http://picflow.koolearn.com/upload/papers/g02/20110913/20110913114821984866.gif]

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