11-12高二·山东潍坊·假期作业
1 . 在等差数列
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a180b409f23cdf1c2519d18823d5d710.png)
(Ⅰ)求通项
;
(Ⅱ)求此数列前30项的绝对值的和.
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572256853147648/1572256858791936/STEM/f3f67f894a2244c9be9b60c3f8306e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a180b409f23cdf1c2519d18823d5d710.png)
(Ⅰ)求通项
![](https://img.xkw.com/dksih/QBM/2015/10/10/1572256853147648/1572256858791936/STEM/68c7483ff74c494f8e58f854d5b37e2f.png)
(Ⅱ)求此数列前30项的绝对值的和.
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2016-12-03更新
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3卷引用:重庆市大足区2018-2019学年高一下学期期末数学试题