名校
1 . 已知
是公比不为1的等比数列
的前
项和,则“
成等差数列”是“存在不相等的正整数
,使得
成等差数列”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089f16d8941a9a57c89a25d1f5fc1017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ae138b4f85019d3faa39b271342adb.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 |
您最近一年使用:0次
2024-03-19更新
|
1358次组卷
|
3卷引用:浙江省宁波市“十校”2024届高三3月份适应性考试数学试题
2 . 正项数列
中,
,对任意
都有
.
(1)求数列
的通项公式及前
项和
;
(2)设
,试问是否存在正整数
,使得
成等差数列?若存在,求出所有满足要求的
;若不存在,请说明理由.
![](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/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44dc4c4ed80420af8e5dbac7a12b5ef.png)
(1)求数列
![](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)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da9c93911c62cb0604be5835400d74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02ed2127693ea75aa7e1fe1e1aa06eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4f74da59a581752f49cc43007ef6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02ed2127693ea75aa7e1fe1e1aa06eb.png)
您最近一年使用:0次
2023-11-14更新
|
361次组卷
|
2卷引用:浙江省金华市武义第一中学2023-2024学年高二上学期12月检测2数学试题
3 . 若正四面体
的棱长为3,平面ABC内有一动点P到平面
、平面
、平面
的距离依次成等差数列,则点P在面
内的轨迹的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334a5773c8d24f29ec3231075170e4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482465f00a75da723e425dbbef2f0bfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
名校
解题方法
4 . 椭圆C:
的长轴长、短轴长和焦距成等差数列,若点P为椭圆C上的任意一点,且P在第一象限,O为坐标原点,
为椭圆C的右焦点,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7b07ace87ed58fdc1f1bc78a04aeda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46fb6a770b0f2e603ab1a779c236450e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
5 . 记
为公比不是1的等比数列
的前n项和.设甲:
,
,
依次成等差数列.乙:
,
,
依次成等差数列.
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357c8144569e482df835ea46b73e5602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354c0f8f84ee314c1853a758f73cfda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9827971dc80f4038c7fee608ea1886c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b8d5b6045219ea4527202ab131bb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacf94481a81f2c7e071bb46ae2a91f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fea3a3863895248228fefdba728edb3.png)
A.甲是乙的充分条件但不是必要条件 |
B.甲是乙的必要条件但不是充分条件 |
C.甲是乙的充要条件 |
D.甲既不是乙的充分条件也不是乙的必要条件 |
您最近一年使用:0次
2023-10-10更新
|
506次组卷
|
2卷引用:浙江省新阵地教育联盟2024届高三上学期第二次联考数学试题
名校
解题方法
6 . 已知数列
成等比数列,
是其前
项的和,若
成等差数列.
(1)证明:
成等差数列;
(2)比较
与
的大小.
![](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/25031fc8db52c0eb66003c7c1a793ef1.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f1d11f9d068368ddc981d662065e93.png)
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/961dbb1fa9cb19a4a7e6358be0c0e062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0930b5a33b051dbbcc597c5b29a57e88.png)
您最近一年使用:0次
名校
7 . 非零实数
满足
成等差数列,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3764eec0b5e3e1415bb225c12d2663c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fcba524ea58286f8bbea28ae85c66c5.png)
A.![]() | B.![]() | C.3 | D.![]() |
您最近一年使用:0次
2023-03-16更新
|
720次组卷
|
2卷引用:浙江省宁波市十校2023届高三下学期3月联考数学试题
名校
解题方法
8 . 设等差数列
的前n项和为
,其公差
,且
,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/5892916236834b88bbae412d97eda48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa4cf1aefcb569197b97ecb8fc4049f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2023-01-19更新
|
603次组卷
|
6卷引用:浙江省嘉兴市第一中学2023-2024学年高二上学期12月阶段测试数学试卷
名校
解题方法
9 . 已知奇函数
且
,
,
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa23f0d7707548d2b741fb6fcda19e70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c26e58c4aedbdc95bbd27bda095b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826f38aab63a2a7a30ed715ff01cda0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c5ff996c7232752fcb65f0a41909cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
您最近一年使用:0次
2022-10-08更新
|
334次组卷
|
2卷引用:浙江省强基联盟2022-2023学年高三上学期10月统测数学试题
解题方法
10 . 已知数列
的前n项和为
,
.
(1)求数列
的通项公式;
(2)判断数列
中是否存在成等差数列的三项,并证明你的结论.
![](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/d1c00f72ed4ed97fb6402e91e6ca888a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84db9ef85ff033c8859d397128890bc8.png)
您最近一年使用:0次