高中数学代数与函数一数列106
题目内容

等差数列 http://picflow.koolearn.com/upload/papers/20140824/20140824023212516456.png中, http://picflow.koolearn.com/upload/papers/20140824/20140824023212547465.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023212687442.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824023212703485.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824023212719388.png为其前 http://picflow.koolearn.com/upload/papers/20140824/20140824023212734297.png项之和,则(  )

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824023212750597.png都小于零,http://picflow.koolearn.com/upload/papers/20140824/20140824023212765534.png都大于零

B.http://picflow.koolearn.com/upload/papers/20140824/20140824023212781594.png都小于零,http://picflow.koolearn.com/upload/papers/20140824/20140824023212797509.png都大于零

C.http://picflow.koolearn.com/upload/papers/20140824/20140824023212812606.png都小于零,http://picflow.koolearn.com/upload/papers/20140824/20140824023212828558.png都大于零

D.http://picflow.koolearn.com/upload/papers/20140824/20140824023212828593.png都小于零,http://picflow.koolearn.com/upload/papers/20140824/20140824023212843547.png都大于零

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