解题方法
1 . 已知
是等比数列,公比大于1,且
,
.记
为
在区间
中的项的个数,则数列
的前30项的和
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb4b599e37a825bce2a0c29f09af8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a316124e688e76d6f330ffbea49d427d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a2e5617c2b812a1952658b1f539c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16765bfe96c4c2733afdf4099a33f5e.png)
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3卷引用:河南省顶级名校2023届高三一轮复习10月月考文科数学试题
2 . 若数列
中不超过
的项数恰为
,则称数列
是数列
的生成数列,称相应的函数
是数列
生成
的控制函数.已知
,
,记数列
的前
项和为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f81f2a0196b06fc56a7e8a6463d179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f478c899fe810ca51cd4c95cb555cdad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f81f2a0196b06fc56a7e8a6463d179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4b5779873cb3f4366dbfdb983dec81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73b85378c1f65d0ca0e4c30a14ccee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1752474698cd5466dd180df0a00ba9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b855e7474604087d38248e9447b5cad6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2卷引用:河南省开封市2021-2022学年高二下学期期末数学理科试题
解题方法
3 . 已知公比大于1的等比数列
满足
,
,数列
的前n项和为
,
.
(1)求
,
的通项公式;
(2)若
,求数列
的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa3a7ce62e7bf557d9e1bf77c8dac0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1038200f2d97a52c716aab6c3bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c602a112af1e3c3a3342e20fd1639f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7376fde28fc77e5a3087c9e11f17bca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70184168a6c164415ac431938ed263b.png)
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|
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4卷引用:河南省安阳市2022-2023学年高三上学期名校调研摸底考试文科数学试题
河南省安阳市2022-2023学年高三上学期名校调研摸底考试文科数学试题河南省安阳市2022-2023学年高三上学期名校调研摸底考试理科数学试题(已下线)专题25 等比数列及其前n项和(已下线)专题25 等比数列及其前n项和-4
名校
4 . 已知数列
,
且
为该数列的前
项和.
(1)猜想数列
的通项公式;
(2)计算
,猜想
的表达式,并用数学归纳法证明;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560632d1cb723b3cbb294e666d5efa23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)猜想数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf4e20ea341827ce5f9552daee39462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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|
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2卷引用:河南省焦作市温县第一高级中学2021-2022学年高二下学期6月月考文科数学试题
5 . 在数列
中,
,且
.
(1)证明:
为等比数列,并求
的通项公式;
(2)令
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45afd2aa9695d0c53c3f61dda4034955.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c895d4ce5ce82ef9b311b9369b4de11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9be5bf50c5db10bdfef370807b0104d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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6 . 已知数列
满足
,
.
(1)证明:数列
为等比数列.
(2)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164659e154e10c13694e2f4a36a3d3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f19112256c661c47057ae72962a3a2a.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd7fe32cbbf55c0ef0edbfb99b31a55.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d1de52d5b738dd058b8afb7e77f337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
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河南省南阳市第一中学校2021-2022学年高三上学期第一次网上训练数学(文)试题(已下线)专题二十 数列求和(已下线)专题27 数列求和-3河南省南阳地区2021-2022学年高二上学期期中热身摸底考试数学试题贵州省黔西南州2021~2022学年高二上学期期中考试数学(理)试题(已下线)第7讲 数列求和9种常见题型总结 (3)
7 . 设数列
的前
项和是
,令
,称
为数列
,
,…,
的“超越数”,已知数列
,
,…,
的“超越数”为2020,则数列5,
,
,…,
的“超越数”为( )
![](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/945d3a467b1c212578437f50146f56fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5e369c19b97b165ae9879e58a2d80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5e369c19b97b165ae9879e58a2d80c.png)
A.2018 | B.2019 | C.2020 | D.2021 |
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7卷引用:河南省新蔡县第一高级中学2021-2022学年高二上学期1月月考数学(文科)试题
河南省新蔡县第一高级中学2021-2022学年高二上学期1月月考数学(文科)试题河南省新蔡县第一高级中学2021-2022学年高二上学期10月半月考数学(文科)试题(已下线)2020年高考全国2数学理高考真题变式题11-15题(已下线)专题09 数列(选择题、填空题)-备战2022年高考数学(文)母题题源解密(全国甲卷)重庆市西南大学附属中学2021届高三下学期第四次月考数学试题(已下线)第04周周练(拓展二:数列求和)(已下线)专题11 数列前n项和的求法 微点10 数列前n项和的求法综合训练
8 . 已知等比数列
满足:
,若
的个位数为
,则数列
的前21项的和( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdeba93dff9becc9771a7edeb6cacd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b3d3d00aeaa5f11deaffdd9cfcef77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
A.60 | B.80 | C.120 | D.180 |
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|
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名校
9 . 数列
的前
项和为
,若
, 则
![](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/a12945873f31f87827ac5c317376ee73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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