设任意项级数 https://assets.asklib.com/psource/2015102616235960752.jpg a n ，若｜a n ｜>｜a n+1 ｜，且 https://assets.asklib.com/psource/2015102616242822803.jpg a n =0，则对该级数下列哪个结论正确（）？

A . A.不能 B . B.能 C . C.不确定

A . 正确 B . 错误

A .https://assets.asklib.com/psource/2015103008505988249.jpg B .https://assets.asklib.com/psource/20151030085113680.jpg C .https://assets.asklib.com/psource/2015103008512720453.jpg D .https://assets.asklib.com/psource/2015103008514346537.jpg

已知任意项级数<img src='https://img2.soutiyun.com/ask/2021-01-28/980677140479276.png' />也发散。

设<img src='https://img2.soutiyun.com/ask/2020-12-14/976814132759786.jpg' />，则收敛半径R=()，故幂级数<img src='https://img2.soutiyun.com/ask/2020-12-14/976814148615693.jpg' />在()绝对收敛，在()一致收敛。

设<img src='https://img2.soutiyun.com/ask/2020-12-17/977061005028657.png' />(n=3,4,5.....)，证明: (1)级数绝对收敛; (2)数列{a_n}收敛.

设幂级数<img src='https://img2.soutiyun.com/ask/2020-11-02/973183367447765.png' />处收敛,则此级数在x=2处() A.条件收敛 B.绝对收敛 C.发散 D.收敛性不能确定

设<img src='https://img2.soutiyun.com/ask/2020-11-02/973182947687756.png' />为收敛的正项级数,证明<img src='https://img2.soutiyun.com/ask/2020-11-02/973182957364309.png' />绝对收敛.

5．设幂级数<img src='https://img2.soutiyun.com/latex/latex.action' />的收敛半径为R(0＜R＜+∞)，则当______时，该幂级数绝对收敛；当______时，该幂级数发散。

设<img src='https://img2.soutiyun.com/ask/2020-12-14/976812927934874.png' />且<img src='https://img2.soutiyun.com/ask/2020-12-14/976812935497307.png' />收敛,则对于任意正数p,级数<img src='https://img2.soutiyun.com/ask/2020-12-14/976812944562825.png' />(). A.绝对收敛 B.条件收敛 C.发散 D.敛散性与p有关

证明函数项级数<img src='https://img2.soutiyun.com/ask/2021-01-28/980691494484278.png' />上是一致收敛的，其中a是小于<img src='https://img2.soutiyun.com/ask/2021-01-28/980691504747866.png' />的任意固定正数。

设级数<img src='https://img2.soutiyun.com/ask/2021-01-21/980070341228634.jpg' />是否也收敛？试说明理由。

设级数<img src='https://img2.soutiyun.com/ask/2021-01-28/980676737626235.png' />也收敛。

B、当p时收敛

A．绝对收敛 B．条件收敛 C．发散 D．不确定

设{a_n}为Fibonacci数列。证明级数<img src='https://img2.soutiyun.com/ask/2021-01-28/980675023860213.png' />收敛，并求其和。

设级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473223462229.jpg' />的绝对值级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473238100066.jpg' />发散，且其发散的结论是由比式判别法或根式判别法得到的，即我们有<img src='https://img2.soutiyun.com/ask/2021-01-14/979473272654042.jpg' />证明级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473324430004.jpg' />一定发散。