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已知定义在 http://picflow.koolearn.com/upload/papers/20140823/20140823233400990403.png上的函数 http://picflow.koolearn.com/upload/papers/20140823/20140823233401021561.pnghttp://picflow.koolearn.com/upload/papers/20140823/20140823233401037550.png,其图象如下图所示: http://picflow.koolearn.com/upload/papers/20140823/201408232334010688003.jpg 给出下列四个命题: ①方程 http://picflow.koolearn.com/upload/papers/20140823/20140823233401224635.png有且仅有6个根   ②方程 http://picflow.koolearn.com/upload/papers/20140823/20140823233401318618.png有且仅有3个根 ③方程 http://picflow.koolearn.com/upload/papers/20140823/20140823233401443616.png有且仅有5个根   ④方程 http://picflow.koolearn.com/upload/papers/20140823/20140823233401474599.png有且仅有4个根 其中正确命题的序号(  )

发布时间:2021-08-04

A.①②③

B.②③④

C.①②④

D.①③④

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