高中数学代数与函数一其他练习题89
题目内容

已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.png的定义域为 http://picflow.koolearn.com/upload/papers/20140824/20140824032112637379.png,部分对应值如下表, http://picflow.koolearn.com/upload/papers/20140824/201408240321126691795.png http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.png的导函数 http://picflow.koolearn.com/upload/papers/20140824/20140824032112700623.png的图象如图所示. http://picflow.koolearn.com/upload/papers/20140824/201408240321127152084.png 下列关于 http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.png的命题: ①函数 http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.png的极大值点为 http://picflow.koolearn.com/upload/papers/20140824/20140824032112747262.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824032112762248.png; ②函数 http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824032112793430.png上是减函数; ③如果当 http://picflow.koolearn.com/upload/papers/20140824/20140824032112809524.png时, http://picflow.koolearn.com/upload/papers/20140824/20140824032112637495.png的最大值是2,那么 http://picflow.koolearn.com/upload/papers/20140824/20140824032112825267.png的最大值为4; ④函数 http://picflow.koolearn.com/upload/papers/20140824/20140824032112840600.png最多有2个零点. 其中正确命题的序号是     (       )

2021-07-16

A.①②

B.③④

C.①②④

D.②③④.

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