名校
解题方法
1 . 已知数列
的前
项和为
,且
是
与
的等差中项,数列
,
,点
直线
上.
(1)求
值;
(2)求数列
的通项公式;
(3)设
,求数列
的前
项和
.
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ca2c0683b40ff13a9770d2355c61b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23fc11a3a7592c68b20f93bdde2ed3f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac07953530e3c248b3438fb200fb1661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2020-12-05更新
|
387次组卷
|
3卷引用:广西来宾市金秀瑶族自治县民族高中2020-2021学年高二上学期期中考试数学试题
名校
解题方法
2 . 已知数列
的前
项和为
,满足
,
,数列
满足
,
,且
.
(1)求数列
的通项公式;
(2)求证:数列
是等差数列,求数列
的通项公式;
(3)若
,数列
的前
项和为
,对任意的
,都有
,求实数
的取值范围.
![](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/c3ddd6d99ad32dd7fdb1797d8cf94786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d24c6e0c1196f3d58699f0c516373a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f997e6d483c0d0990cb550bbde39fa9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c145ede47d16cc36fa56d2d32ae57c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc15e3dbd6a918cc210f0f88db7e7b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcedf6f6b2529e3aadd705dd746df8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-03-03更新
|
1371次组卷
|
9卷引用:广西北海中学2019-2020学年高二上学期期中数学(文)试题
广西北海中学2019-2020学年高二上学期期中数学(文)试题四川省攀枝花市第十五中学2019-2020学年高一下学期期中考试数学(理科)试题天津经济技术开发区第一中学2023届高三上学期期中数学试题【全国百强校】江西省南昌市第十中学2018-2019学年高一下学期第二次月考数学(文科)试题江西省抚州市临川一中2018-2019学年高一下学期期末数学试题安徽省合肥市六校联盟2018-2019学年高一下学期期末数学试题江西省石城中学2020-2021学年高一下学期第二次月考数学(理)试题天津市河北区2022届高三下学期总复习质量检测(二)数学试题天津市河东区2024届高三上学期期末质量调查数学试题
名校
3 . 已知等比数列
的前
项和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1078cc3db9212c18f098170e8c9d4e0.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/267b6e912c461dadc3d9588c814a3981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1078cc3db9212c18f098170e8c9d4e0.png)
A.![]() | B.3 | C.6 | D.9 |
您最近一年使用:0次
2019-03-12更新
|
1096次组卷
|
6卷引用:广西桂林市第十八中学2021-2022学年高二上学期期中考试数学(理)试题
解题方法
4 . 在等比数列
中,已知其前n项和
,则a的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42a88963d75dc3fd29dce447b122f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.![]() | B.1 | C.![]() | D.2 |
您最近一年使用:0次
2018-12-11更新
|
421次组卷
|
2卷引用:【校级联考】广西南宁市马山县金伦中学“4+ N”高中联合体2018-2019学年高二上学期期中考试数学(文)试题