1 . 已知等比数列
的公比为
,前
项和为
,若
,
,
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.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/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f52ab6a9d47d0d34d14b2399c6c4ccf.png)
A.![]() | B.1 | C.![]() | D.2 |
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2020-09-22更新
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5卷引用:河南省中原名校联盟2020-2021学年高三上学期第一次质量考评数学(文科)试题
名校
解题方法
2 . 已知
分别为椭圆
的左、右焦点,点
在椭圆E上,且
.
(1)求椭圆E的方程;
(2)过
的直线
分别交椭圆E于
和
,且
,问是否存在实数
,使得
成等差数列?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480f004c98a0df86a35a48bc973f0472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f595683f69d5d6b5ca76408b0ff6ff17.png)
(1)求椭圆E的方程;
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41690fbbd33481155425ac05f85c9bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2020-09-20更新
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4卷引用:云南省玉溪第一中学2021届高三上学期第二次月考数学(文)试题
云南省玉溪第一中学2021届高三上学期第二次月考数学(文)试题安徽省宣城市郎溪县2020届高三下学期仿真模拟考试(最后一卷)理科数学试题安徽省阜阳市太和中学2019-2020学年高二下学期期末数学(文)试题(已下线)专题5 焦点弦长 公式性质 讲(高考真题素材库之典型好题母题)
名校
3 . 等比数列
满足
,数列
的前n项和为
,且
.
(1)求
和
的表达式;
(2)是否存在正整数m,使得
,
,
成等差数列?若存在,求出所有m的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25673902449184f5727cbc786aa82a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65a658dc2dbc5aa141a49adc5068365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a00a7a6efb07e9a66809b988c3c65b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd56c886d76991ec450d4aa1b7a6174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)是否存在正整数m,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5606524a0b5be8d429bf1da36aa02de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7732fa58ee6b83ff15c81af8a758d8bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c69b2580322e46d091ac44accf7d0b.png)
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解题方法
4 . 已知
,
均为正数,且
,
,
成等差数列,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387fbec250db446704de21760f8dfa25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
A.4 | B.3 | C.![]() | D.![]() |
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2020-09-19更新
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989次组卷
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2卷引用:河北省邯郸市2021届高三上学期摸底数学试题
名校
解题方法
5 . 设
是公比大于1的等比数列,
,且
是
,
的等差中项.
(1)求数列
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/e9206ee6226848a8925d31233aa2e42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d93c1ae7b22099a5d4c1c4241e5ca18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a2dcb05ff1297c8c7b9bc5023e9432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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4卷引用:广东省广州市六区2021届高三上学期9月教学质量检测(一)数学试题
广东省广州市六区2021届高三上学期9月教学质量检测(一)数学试题福建省厦门科技中学2021届高三10月月考数学试题(已下线)对点练39 等比数列及其前n项和-2020-2021年新高考高中数学一轮复习对点练广东省梅州市大埔县虎山中学2024届高三上学期开学考试数学试题
6 . 设数列
,
,
,
满足前三项成等比数列且和为
,后三项成公差不为0的等差数列且和为12,若满足条件的数列个数大于1,则
的取值范围是_______ .
![](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/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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7 . 已知椭圆
,过左焦点
的动直线交椭圆于
,
两点,
为直线
上一定点(不是与
轴的交点),直线
,
,
的斜率分别为
,
,
.
(1)判断
,
,
是否恒为等差数列,若是,给出证明;若不是,请说明理由;
(2)对任意给定的点
,是否都存在一条过点
的直线
,使得
,
,
为等比数列?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4129f43a6af21631251511e63e2ac4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051be09b4e835cf68f624541a843018d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
(2)对任意给定的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
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2020-09-14更新
|
360次组卷
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2卷引用:浙江省平阳县浙鳌高级中学2021届高三上学期期初教学质量监测数学试题
20-21高二·全国·单元测试
名校
解题方法
8 . 已知等比数列{an}中,公比为q,a2=3,且﹣1,q,7成等差数列,又bn=log3an,数列{bn}的前n项和为Tn,则T9( )
A.36 | B.28 | C.45 | D.32 |
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2020-09-09更新
|
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8卷引用:四川省内江市第六中学2020届高三热身考试数学(文)试题
四川省内江市第六中学2020届高三热身考试数学(文)试题2019年11月四川省遂宁市零模数学(理)试题山西省太原市第五中学2022届高三上学期第四次模块诊断数学(文)试题安徽省滁州市第二中学2022届高三下学期4月模底检测文科数学试题新疆维吾尔自治区乌鲁木齐市第十二中学2024届高三上学期8月月考数学(理)试题(已下线)第2章+数列(基础过关)-2020-2021学年高二数学单元测试定心卷(苏教版必修5)(已下线)热点07 数列与不等式-2021年高考数学(文)【热点·重点·难点】专练四川省成都市金牛区成都七中万达学校2023-2024学年高三上学期期中文数试题
解题方法
9 . 等比数列
中,若
,
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232688e3f74c295adc4cc602c4603929.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/51da92a1610893fdb1b65532090f116a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232688e3f74c295adc4cc602c4603929.png)
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|
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4卷引用:2020届江苏省常州市高三上学期期末数学试题
2020届江苏省常州市高三上学期期末数学试题2020届高三2月第02期(考点06)(文科)-《新题速递·数学》陕西省渭南市韩城市新蕾中学2021-2022学年高三上学期第二次月考数学试题(已下线)第2章+数列(能力提升)-2020-2021学年高二数学单元测试定心卷(苏教版必修5)
名校
10 . 若等比数列
的前
项和为
,且
,
为
与
的等差中项,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/3e40778be6b90e9e04b8234419b3a8cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47bf269ab9edd83336b48f05d9f4ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9620357ea5be4037cfdccd09a27d3862.png)
A.29 | B.33 | C.31 | D.30 |
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2021-09-12更新
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7卷引用:内蒙古北京八中乌兰察布分校2016-2017学年高二下学期第二次调考数学(理)试题
内蒙古北京八中乌兰察布分校2016-2017学年高二下学期第二次调考数学(理)试题2020届陕西省西安中学高三下学期第三次模拟考试数学(文)试题安徽省滁州市定远县民族中学2021-2022学年高三9月教学质量检测数学(文)试题天津市静海区第六中学2021-2022学年高三上学期开学摸底考试数学试题江西省赣州市赣县第三中学2021-2022学年高二9月考试数学(文)试题江西省赣州市赣县第三中学2021-2022学年高二9月考试数学(理)试题(已下线)4.3.1-4.3.2 等比数列的概念及通项公式(课堂培优)-2021-2022学年高二数学课后培优练(苏教版2019选择性必修第一册)