设等差数列{an}的前n项和为Sn,若3a6=6+a4,则S13的值等于( )
A.26 | B.39 | C.52 | D.65 |
更新时间:2020-09-23 15:59:12
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【推荐2】由
,
确定的等差数列
,当
时,序号
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f2572192cc7ca046e9a3155ef3e56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a30578182fe2d83081f9ef62da0fb65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.80 | B.100 | C.90 | D.88 |
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解题方法
【推荐1】等差数列{
}中,
,则前10项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48dd92a2a3a604b8f80400bf8c67302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
A.5 | B.25 | C.50 | D.100 |
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容易
(0.94)
名校
解题方法
【推荐2】将棱长相等的正方体按如图所示的形状摆放,从上往下依次为第一层、第二层、第三层……,则第
层正方体的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6a32555c-7706-4ad1-ab20-d93308411909.png?resizew=99)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b4f2691ecc2dbd44e912c73905b4c4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6a32555c-7706-4ad1-ab20-d93308411909.png?resizew=99)
A.![]() | B.![]() | C.![]() | D.![]() |
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