高中数学代数与函数一其他练习题143
题目内容

已知函数 http://picflow.koolearn.com/upload/papers/20140823/20140823181534623790.gif,且 http://picflow.koolearn.com/upload/papers/20140823/20140823181534638357.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823181534654450.gif.那么下列命题中真命题的序号是 ① http://picflow.koolearn.com/upload/papers/20140823/20140823181534685270.gif的最大值为 http://picflow.koolearn.com/upload/papers/20140823/20140823181534701295.gif             ② http://picflow.koolearn.com/upload/papers/20140823/20140823181534685270.gif的最小值为 http://picflow.koolearn.com/upload/papers/20140823/20140823181534701295.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823181534763275.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823181534779292.gif上是减函数      http://picflow.koolearn.com/upload/papers/20140823/2014082318153479485.gif      ④ http://picflow.koolearn.com/upload/papers/20140823/20140823181534763275.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823181534904287.gif上是减函数

2021-07-21

A.①③

B.①④

C.②③

D.②④

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