已知正项 等比数列
,
,且
,
,
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd21f4cb498101d26b4aaa2e1a6addc.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b42a580c957be7f0fe5e0de6693d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd21f4cb498101d26b4aaa2e1a6addc.png)
更新时间:2024-02-23 22:21:44
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填空题-单空题
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适中
(0.65)
解题方法
【推荐1】已知等差数列
的前n项和为
,若
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4b5a382f920203b9ef307224ae641e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032654b4a3c2f77c39a4647072a8503f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4b5a382f920203b9ef307224ae641e.png)
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填空题-单空题
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适中
(0.65)
【推荐2】等差数列
的前三项为
,则数列的通项公式![](https://img.xkw.com/dksih/QBM/2016/8/16/1572978758139904/1572978763530240/STEM/d4e6f3558f44434080b4a07a9d8e5e94.png?resizew=33)
_______ .
![](https://img.xkw.com/dksih/QBM/2016/8/16/1572978758139904/1572978763530240/STEM/109734d7479e4ffaa1852e8f9eeb412c.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1572978758139904/1572978763530240/STEM/683c342ac44244a0ad47eaf6790ebeb2.png?resizew=111)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1572978758139904/1572978763530240/STEM/d4e6f3558f44434080b4a07a9d8e5e94.png?resizew=33)
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
名校
【推荐1】公差不为0的等差数列
的部分项
构成等比数列,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b85e2442d2b9dca2efed03fa3d995.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b348973f087e5f597e24ce8ad9d7472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eaa992a449b828df0ff545e233b279b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7878f57ca07692f6295d5fbb1067f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3542894ef1dc407a0d55d4fa9f1a8c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b85e2442d2b9dca2efed03fa3d995.png)
您最近一年使用:0次
【推荐2】设
为数列
的前
项和,
,且
,记
为数列
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978d7bd6f6caf9ac9837ffce5f89654.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/40c84d579555da280af822a7e689dcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3591a6fa3bbc87b646967ff838369d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbdfdf19633ec8fba72b3059a8e818d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978d7bd6f6caf9ac9837ffce5f89654.png)
您最近一年使用:0次
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解题方法
【推荐1】在各项为正数的数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed847caaf78ca181caa8c30abc9875d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】已知等比数列
的公比
,且
,则使
成立的正整数
的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535fd9605b90ac7f0fed6025be9f851f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d4e304fe5bd82ae3f85011e3775665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb9fb5bd4ccb1e179c7cae357efee76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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