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已知 http://picflow.koolearn.com/upload/papers/20140824/20140824041829089289.png是平面区域 http://picflow.koolearn.com/upload/papers/20140824/201408240418291051177.png内的动点,向量 http://picflow.koolearn.com/upload/papers/20140824/20140824041829121296.png=(1,3),则 http://picflow.koolearn.com/upload/papers/20140824/20140824041829121463.png的最小值为(    )

发布时间:2021-07-19

A.-1

B.-12

C.-6

D.-18

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