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已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824050505847738.png在x 1处取得极大值,在x 2处取得极小值,且x 1∈(-1,1),x 2∈(1,2),则2a+b的取值范围是(   )

发布时间:2021-07-19

A.(-7,2)

B.(-7,3)

C.(2,3)

D.(-1,2)

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