解题方法
1 . 已知数列
的首项等于3,从第二项起是一个公差为2的等差数列,且
成等比数列.
(1)求数列
的前
项和
;
(2)设数列
满足
且
,若数列
的前
项的和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b1b845916a4b6a18cdfbcd308d09c4.png)
(1)求数列
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c4352eef6a1c7c890209635b1f7895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade45a24e9b556731f4e205f119cae7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.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/6c50d694167d9c7eeaf58c9574450790.png)
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2 . 若项数均为
的两个数列
满足
,且集合
,则称数列
是一对“
项紧密数列”.设数列
是一对“4项紧密数列”,则这样的“4项紧密数列”有( )对.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5432a8b1081ecb4a8c4943faad484541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54946204c502727ffaee3c0172d195a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f11437ef2c39a14cffb0d36c8d9c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
A.5 | B.6 | C.7 | D.8 |
您最近一年使用:0次
名校
解题方法
3 . 数学家也有一些美丽的错误,如法国数学家费马于
年提出了以下猜想:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db844e93e981ddf3d3e626e160c0ed1.png)
是质数.
年,瑞士数学家欧拉算出
,该数不是质数.已知
为数列
的前
项和,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5877b16c07b433303f407a2b9917500a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b27c3739c67afe2ce2b009e3080119.png)
(1)求数列
的通项公式;
(2)若
,设为数列
的前
项和,求出
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79137b26772882006a7d5e307dceeb48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db844e93e981ddf3d3e626e160c0ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2512c1f02995f149ed8ded9e118895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1f8602f1c07dc1033bad85e190bcfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ac5abd893e2158c86f56e697f452ff.png)
![](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/5877b16c07b433303f407a2b9917500a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b27c3739c67afe2ce2b009e3080119.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdbf5c03396141d30188d5bee2a36f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e55c84e39d163be9b5f05be0d279fd7.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
名校
4 . 已知离散型随机变量
服从二项分布
,其中
,记
为奇数的概率为
,
为偶数的概率为
,则下列说法中不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66562230293975e4ac391943ae62054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d787593ec73d53b1504397cabe532d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
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名校
解题方法
5 . 记等差数列
的前
项和为
,已知
,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/1cd2b297b8df4fbcebbe496c0c89a0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30eb42578f654fb61e826026d2199751.png)
A.33 | B.44 | C.55 | D.66 |
您最近一年使用:0次
2024-05-07更新
|
816次组卷
|
3卷引用:安徽省安庆市第一中学2024届高三下学期6月第四次模拟(热身考试)数学试卷
安徽省安庆市第一中学2024届高三下学期6月第四次模拟(热身考试)数学试卷河南省南阳市第一中学校2023-2024学年高三下学期模拟预测数学试题(已下线)山东省淄博实验中学2024届高三下学期第三次模拟考试数学试题
解题方法
6 . 已知数列
的前n项和为
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300dca231e2f4b37f70900b33439d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77934eeb5a4bff61a5dbfab837fea793.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
7 . 在下列四个式子确定数列
是等差数列的条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
8 . 已知
是数列
的前n项和,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
________ .
![](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/8058bca6dab36ed8329eef012da95994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
9 . 满足
,
,
的数列
称为卢卡斯数列,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1307cea22924d8054fb3bbe82588c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.存在非零实数t,使得![]() |
B.存在非零实数t,使得![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
2024-03-14更新
|
996次组卷
|
5卷引用:安徽省安庆市2024届高三模拟考试(二模)数学试题
10 . 设
是公比不为1的无穷正项等比数列,则“
为递减数列”是“存在正整数
,对任意的正整数
,
”的( )
![](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/4d7e9f86738335a22298559db41037a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1591c10d6af25780ba5bfcd82f2cb366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25809c4ad8f07e80b10fdb5b40d6dfae.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