等差数列
的前
项和为
,若
,则满足
的正整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/51785fc99f097e27659f720bec95d122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8e1bb201b13f61d9f8916f20925439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
更新时间:2020-03-04 21:20:47
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【知识点】 利用等差数列的性质计算
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填空题-双空题
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适中
(0.65)
解题方法
【推荐1】已知函数
,若函数
,则函数
的图像的对称中心为______ ;若数列
为等差数列,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a38580403a0d2d97237e08bc36b903.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc6af723f2ecc6fd79b4baf99f0b8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb247bfc5b1ade44bf83fc4c2b56c3b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4d81af15112d7fbcfb10fa8245e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a38580403a0d2d97237e08bc36b903.png)
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【推荐2】已知各项不为0的等差数列{an}满足2a2-
+2a12=0,数列{bn}是等比数列,且b7=a7,则b3b11等于____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a52616446c7d86d7d216a522d7ac61.png)
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