名校
1 . 已知等差数列
的公差为d,随机变量
满足
,
,则d的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce31f84a0f2e6a750e4ef90fe11bae8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79059a3366ed1b339ba1317ce8a1e7f9.png)
您最近一年使用:0次
名校
解题方法
2 . 已知数列
的前n项和为
,且
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ed0323effaccec8508320880b02cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16765bfe96c4c2733afdf4099a33f5e.png)
A.0 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-04-03更新
|
698次组卷
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4卷引用:江西省宜春市丰城市东煌学校2022-2023学年高二下学期期中数学试题
江西省宜春市丰城市东煌学校2022-2023学年高二下学期期中数学试题湖北省咸宁市鄂南高级中学2022-2023学年高二下学期阶段性检测(9)数学试题宁夏银川市第二中学2023-2024学年高二上学期月考二数学试卷(已下线)4.2.2 等差数列的前n项和公式(8大题型)精练-2023-2024学年高二数学题型分类归纳讲与练(人教A版2019选择性必修第二册)
3 . 在等差数列{an}中,已知
为方程
的两根,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3480c1588d7838fbc46aea96694fc76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d889a5593d971f0f6f3af5be707afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
您最近一年使用:0次
名校
4 . 已知等差数列
的前n项和为
,
,
,等比数列
中,
,且
,
,
成等差数列.
(1)求数列
和
的通项公式;
(2)记
,求使
成立的
的最小值.
![](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/530a84c42bcd6284f752676e62363ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68056fe9240de51e0e91b00c348f817b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ae7c6918ce23abc50e28ca7aa8eba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb9df58523d9c6ddb4770055441fd72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d1bd10b5c9caf7c00cb9f8f2149242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bfc3e510c8ceef112b0fdbd36faf54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
5 . 已知椭圆
的焦距为
,且
成等差数列,则椭圆
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dcc91c2ffb5571eaf944c34f5e8ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 已知
,成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c0fe4561f73a15cffd1f4bfda8690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
您最近一年使用:0次
2023-02-07更新
|
316次组卷
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2卷引用:江西省上饶市民校考试联盟2022-2023学年高二下学期阶段测试(四)数学试题
名校
7 . 已知三角形中三边长为
,
,
,若
,
,
成等差数列,则直线
与直线
的位置关系为( )
![](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/24106d94bf13cac0501cdb695b9972c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489ac3f68848980d53033dbd65a0a622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba73c0fc1d96654151175cc84b792c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db6cdba50b795d84a5b780b2e9605c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8147ff87bee23168ffd338f325cd115b.png)
A.平行 | B.相交但不垂直 | C.垂直 | D.重合 |
您最近一年使用:0次
2023-01-14更新
|
332次组卷
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3卷引用:江西省寻乌中学2022-2023学年高二下学期期中数学试题
名校
8 . 在等差数列
中,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856789e8ef3064cab89d8de2daf6069d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a1c59a23cf95dccc65daf198f0b874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c47fc8df6f62a1c1fc2bde7e49ef042.png)
A.8 | B.9 | C.10 | D.11 |
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2022-12-10更新
|
1116次组卷
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4卷引用:江西省南昌市第十九中学2022-2023学年高二下学期期末考试数学试卷
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9 . 已知等差数列
的前n项和为
,若
,
,则公差为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94339474cfe61111f152ef1636c8c5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
A.-3 | B.-1 | C.1 | D.3 |
您最近一年使用:0次
2022-01-05更新
|
2479次组卷
|
14卷引用:江西省赣州市立德虔州高级中学2022-2023学年高二下学期第二次月考数学试题
江西省赣州市立德虔州高级中学2022-2023学年高二下学期第二次月考数学试题湖北省武汉市洪山高级中学2022-2023学年高二下学期2月月考数学试题河南省鹤壁市高中2022-2023学年高二下学期第一次段考数学试题湖北省部分重点中学2022-2023学年高二下学期3月联合检测数学试题云南省大理白族自治州民族中学2022-2023学年高二下学期3月月考数学试题福建省泉州市第九中学2022-2023学年高二下学期3月月考数学试题黑龙江省牡丹江市第三高级中学2022-2023学年高二下学期期中数学试题安徽省安庆市第九中学2022-2023学年高二下学期期中数学试卷湖北省宜昌一中、荆州中学、龙泉中学三校2021-2022学年高二下学期3月阶段性检测数学试题(已下线)选择性必修第二册综合检测卷-2021-2022学年高二数学特色专题卷(人教A版2019选择性必修第二册)江西省宜春市2022届高三模拟考试数学(文)试题河北省石家庄二中实验学校2021-2022学年高二下学期4月月考数学试题福建省南安市侨光中学、昌财实验中学2021-2022学年高二下学期第4次联考(期中)数学试题重庆市2022届高三上学期第五次质量检测数学试题
名校
解题方法
10 . 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)
您最近一年使用:0次
2022-02-17更新
|
678次组卷
|
3卷引用:江西省大余中学2022-2023学年高二下学期期末学情调研数学试题