名校
解题方法
1 . 已知公比大于1的等比数列
满足
,
,
.
(1)求数列
的通项公式;
(2)记
,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6315d13bbeb7bbf4c26ef7e5db994d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527bd6adefbb15deb6ad829d7584d072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-03-07更新
|
1086次组卷
|
4卷引用:陕西省安康市2023届高三下学期二模文科数学试题
2 . 设等比数列
满足
,
,记
为
中在区间
中的项的个数,则数列
的前50项和
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8998e39d9ba7d2d16780e904a97d00af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435ce83d7ed3a84f4db44faaa0371e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf3a1de520e650db5586b0c6f58e328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b024dcba89b9bc12300583e25c1ed90.png)
A.109 | B.111 | C.114 | D.116 |
您最近一年使用:0次
2022-12-12更新
|
419次组卷
|
4卷引用:陕西省安康市2023届高三上学期12月一模文科数学试题
名校
解题方法
3 . 已知等差数列
的前n项的和为
,
.数列
的前n项和为
,
.
(1)求数列
和
的通项公式;
(2)若
,数列
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ddff69d701e604da0d72e3135f34c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4094ee8ecfc4f5b2cffe032b1ed8ab2b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca857b7a6a1fe09827ecaa5f4c036069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cebd54bd9981339b243ead12140ac7e.png)
您最近一年使用:0次
2022-12-12更新
|
1063次组卷
|
3卷引用:陕西省安康市2023届高三上学期12月一模理科数学试题
名校
解题方法
4 . 设等比数列
满足
,记
为
中在区间
中的项的个数,则数列
的前50项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b024dcba89b9bc12300583e25c1ed90.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99f21b5772c4251de6922392c853758f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c03166e6456c15029aea381100cb7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b024dcba89b9bc12300583e25c1ed90.png)
您最近一年使用:0次
2022-12-12更新
|
499次组卷
|
3卷引用:陕西省安康市2023届高三上学期12月一模理科数学试题
解题方法
5 . 已知等比数列
的前n项和为
.
(1)求实数k的值,并求出数列
的通项公式;
(2)令
,设
为数列
的前n项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43b84cc8dbe761a22d1b0f56fdd65df.png)
(1)求实数k的值,并求出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a60c3459b0566763aff0a9b49a16dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
您最近一年使用:0次
名校
解题方法
6 . 已知数列
的前n项和为
,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/2814be664a8e81cdbf87e24c11eb985d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
A.129 | B.132 | C.381 | D.384 |
您最近一年使用:0次
2022-04-09更新
|
989次组卷
|
4卷引用:陕西省安康市2022届高三下学期4月三模文科数学试题
陕西省安康市2022届高三下学期4月三模文科数学试题河南省开封市2021-2022学年高三下学期核心模拟卷(中)文科数学试题(已下线)查补易混易错点09 数列-【查漏补缺】2022年高考数学(文)三轮冲刺过关(已下线)必刷卷03(文)-2022年高考数学考前信息必刷卷(全国甲卷)
解题方法
7 . 已知数列
的前
项和
,数列
是各项均为正数的等比数列,其中
,且
成等差数列.
(1)求
的通项公式;
(2)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/57c599e7cec6d192fb73218e7882ceca.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/1f78a88de49754d5b9ac0c4d81fb0bc4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.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
2022-01-25更新
|
495次组卷
|
2卷引用:陕西省安康市2019届高三第一次教学质量联考理科数学试题
解题方法
8 . 已知函数
.
(1)求函数
的极值;
(2)证明:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef278509c5a53f41402ecf1785c883e.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8365233f341451598eb50525a1557a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec5f0a10e28f80b2f5b1a40afa72494.png)
您最近一年使用:0次
解题方法
9 . 若一个等比数列的公比为3,且首项为2,则该数列的第4项为( )
A.18 | B.36 | C.54 | D.162 |
您最近一年使用:0次
2022-09-29更新
|
621次组卷
|
3卷引用:陕西省安康市2019届高三下学期第二次教学质量联考文科数学试题
陕西省安康市2019届高三下学期第二次教学质量联考文科数学试题(已下线)4.3.1等比数列的概念(第1课时)(分层作业)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第二册)陕西省榆林市神木市第四中学2023-2024学年高二下学期开学检测考试数学试题
10 . 已知数列
为等比数列,
,且
是
与
的等差中项.
(1)求
的通项公式;
(2)设
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f36fcd81142614c2393024e1950e5a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5fc0b571e6545e133d36af338733b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2022-09-29更新
|
944次组卷
|
3卷引用:陕西省安康市2019届高三第一次教学质量联考文科数学试题