高中数学代数与函数一数列106
题目内容

若数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021429998456.png的前n项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824021430138388.png,则下列命题: (1)若数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021429998456.png是递增数列,则数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021430170489.png也是递增数列; (2)数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021430170489.png是递增数列的充要条件是数列 http://picflow.koolearn.com/upload/papers/20140824/20140824021429998456.png的各项均为正数; (3)若 http://picflow.koolearn.com/upload/papers/20140824/20140824021429998456.png是等差数列(公差 http://picflow.koolearn.com/upload/papers/20140824/20140824021430232443.png),则 http://picflow.koolearn.com/upload/papers/20140824/20140824021430248667.png的充要条件是 http://picflow.koolearn.com/upload/papers/20140824/20140824021430279638.png (4)若 http://picflow.koolearn.com/upload/papers/20140824/20140824021429998456.png是等比数列,则 http://picflow.koolearn.com/upload/papers/20140824/201408240214303101106.png的充要条件是 http://picflow.koolearn.com/upload/papers/20140824/20140824021430326552.png 其中,正确命题的个数是(   )

2021-09-28

A.0个

B.1个

C.2个

D.3个

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