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/20140824/20140824015922888457.png的前n项和为 http://picflow.koolearn.com/upload/papers/20140824/20140824015922903388.png, 公差为d, 已知 http://picflow.koolearn.com/upload/papers/20140824/20140824015922919898.png http://picflow.koolearn.com/upload/papers/20140824/20140824015922934979.png, 则下列结论正确的是（   ）

2021-09-28

A.http://picflow.koolearn.com/upload/papers/20140824/20140824015922950856.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824015922966860.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824015922966861.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824015922981864.png

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