名校
1 . 已知
为等差数列,前n项和为
,若
,则
( )
![](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/81f7ba6e9026f81f5c2cc9ae793c175b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b0cab25a92b816156d5af0eb2917ae.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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2 . 已知数列
是等比数列,
是其前
项和,则“
成等差数列”是“
成等差数列”的( )
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efce67f8baa503fc861f51f8b4616bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508366d3432627658d43cb1252ca5239.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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2022-03-18更新
|
362次组卷
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4卷引用:江苏省靖江中学、丹阳中学、沭阳中学三校2021-2022学年高三上学期12月联考数学试题
江苏省靖江中学、丹阳中学、沭阳中学三校2021-2022学年高三上学期12月联考数学试题(已下线)1.2 逻辑用语与充分、必要条件(精练)-【一隅三反】2023年高考数学一轮复习(提升版)(新高考地区专用)(已下线)湖南省长沙市雅礼中学2024届高三上学期月考(二)数学试题变式题6-10(已下线)4.3.2等比数列的前n项和公式(第2课时)(分层作业)(3种题型)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第二册)
3 . 已知等比数列
的各项均为正数,
,且
,
,
成等差数列.
(1)求数列
的通项公式;
(2)设
,求数列
的前n项和
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9672dc9adb691f441a1b87a0bc28d854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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解题方法
4 . 已知数列
的前
项和为
,
,
,
,其中
为常数.
(1)证明:
;
(2)若
为等差数列,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa01f03fb074bff35b35e07047d11b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdc305f1ec88235947e0d137dc0fb75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce8429376dc577ccfbc9e34cd41986b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
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2022-02-24更新
|
259次组卷
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5卷引用:江苏省苏州市高新区第一中学2021-2022学年高三上学期10月月考数学试题
名校
解题方法
5 . 定义
为数列
的“优值”,已知某数列
的“优值”
,数列
的前
项和
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccef26358d64ade0077e99c40bab4d35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7500fade650ab341d8a2b0836d41ce.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)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
6 . 设
是首项为1的等比数列,若
,
,
,成等差数列,则通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2667a6c91b720ca9b42d092c776cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f6aba03136f0c6d7c4de8f2a6e63b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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2022-02-17更新
|
678次组卷
|
3卷引用:江苏省淮安市淮阴中学2021-2022学年高三上学期12月月考数学试题
2022高三·全国·专题练习
名校
解题方法
7 . 在
中,内角
,
,
所对的边长分别为
,
,
,
是1和
的等差中项.
(Ⅰ)求角
;
(Ⅱ)若
边上的中线长为
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ea513ef4c8fc4d8c31eff498740680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4239165ee886662653d8da4c567a79d.png)
(Ⅰ)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2021-10-08更新
|
1147次组卷
|
5卷引用:山西省怀仁市第一中学2022届高三上学期第三次月考数学(理)试题
山西省怀仁市第一中学2022届高三上学期第三次月考数学(理)试题山东省济宁市嘉祥县第一中学2021-2022学年高三上学期期中考试数学试题山东省潍坊市五县区2024届高三上学期10月阶段性测试数学试题(已下线)第六章 解三角形专练9—综合练习(一)-2022届高三数学一轮复习河南省濮阳市第一高级中学2021-2022学年高二上学期期中质量检测数学(理)试题
名校
8 . 若实数a,b满足a,3,b成等差数列,则ab的最大值为______ .
您最近一年使用:0次
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9 . 已知
为等差数列
的前
项和,若
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63246f7331bdb296e3aba8127a67a889.png)
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16a211fb91a9c026dac1ad1adf0463d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9b948f046fc5c831d55541149d07d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63246f7331bdb296e3aba8127a67a889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115e1d7a31834c200e2391748e285699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.12 | B.18 | C.24 | D.30 |
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2022-02-08更新
|
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|
2卷引用:安徽省江淮十校2021-2022学年高三上学期11月第二次联考理科数学试题
10 . 已知数列
是等比数列,
是等差数列,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92a610b18559cbac2c447808cc51eac.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51419bf19a92b911476df3566e138e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2107f3928cf89d7e5e2059df16355b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92a610b18559cbac2c447808cc51eac.png)
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2022-02-08更新
|
207次组卷
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2卷引用:安徽省十校联盟2021-2022学年高三上学期11月联考理科数学试题