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已知非零向量 http://picflow.koolearn.com/upload/papers/20140823/20140823224112828391.png满足: http://picflow.koolearn.com/upload/papers/20140823/20140823224112843526.png,若函数 http://picflow.koolearn.com/upload/papers/20140823/201408232241128901131.pnghttp://picflow.koolearn.com/upload/papers/20140823/20140823224113015303.png上有极值,设向量 http://picflow.koolearn.com/upload/papers/20140823/20140823224112828391.png的夹角为 http://picflow.koolearn.com/upload/papers/20140823/20140823224113046297.png,则 http://picflow.koolearn.com/upload/papers/20140823/20140823224113077430.png的取值范围为(   )

发布时间:2021-07-15

A.[http://picflow.koolearn.com/upload/papers/20140823/20140823224113093425.png

B.http://picflow.koolearn.com/upload/papers/20140823/20140823224113108474.png

C.http://picflow.koolearn.com/upload/papers/20140823/20140823224113140443.png

D.http://picflow.koolearn.com/upload/papers/20140823/20140823224113155493.png

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