在公差不为零的等差数列
中,
,且
成等比数列.
(1)求数列
的通项公式;
(2)设数列
的前
项和
,求
;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcd9a1492c60152f2e32604cd519e72.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4844ada5b5eb39d704345bb4e6080d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6104c8adc6023374cd56a93ff501a14.png)
更新时间:2019-12-02 19:48:32
|
相似题推荐
【推荐1】在①
,②
为常数
,③
,这三个条件中选择一个,补充在下面横线中,并给出解答.
已知等差数列
的前
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,
,且________.
(1)求
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(2)求数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762ed78224f86d0a24cf4b7fc1eed906.png)
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已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d31d838f1c9455b912e71317b4d9bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8170fd7e51aa2c8bb82e1be17f4922.png)
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【推荐2】在①
,
;②公差为1,且
成等比数列;③
,
,三个条件中任选一个,补充在下面问题中,并给出解答.
问题:已知等差数列
的前
项和为
,且满足___________
(1)求数列
的通项公式;
(2)令
,其中
表示不超过
的最大整数,求
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36183db0759eec0e108274d229fcd00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca2cc2768794136c1e4da47d2f0873e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b1b845916a4b6a18cdfbcd308d09c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11872e2a261f126308bb4e8f3c2ad33.png)
问题:已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad810e3e145f58d5c569dcaed7df0224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a47750f1d97fb5d63669836a0927c60.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
解答题-问答题
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适中
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa5b0f0770bf492072bdf5ccce4c8193.png)
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