若数列
满足
,且
,则数列
的前100项中,能被5整除的项数为
![](https://img.xkw.com/dksih/QBM/2017/1/29/1619474514223104/1619474514575360/STEM/0c9d29fd427c477ca7ca532380f711be.png)
![](https://img.xkw.com/dksih/QBM/2017/1/29/1619474514223104/1619474514575360/STEM/07ab92bfdb9f4146896a0ee9f6b17d2b.png)
![](https://img.xkw.com/dksih/QBM/2017/1/29/1619474514223104/1619474514575360/STEM/b78e9d3549e44b4988b35df4670e70d4.png)
![](https://img.xkw.com/dksih/QBM/2017/1/29/1619474514223104/1619474514575360/STEM/0c9d29fd427c477ca7ca532380f711be.png)
A.42 | B.40 |
C.30 | D.20 |
更新时间:2017-01-17 16:56:43
|
【知识点】 数列的综合应用
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【推荐2】数列{an}的前n项和为Sn,若
,则a5=
![](https://img.xkw.com/dksih/QBM/2016/3/9/1572527516459008/1572527521406976/STEM/13b7cc67b2ad42c5b57f1a1ea3201375.png)
A.13 | B.25 | C.30 | D.35 |
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