解题方法
1 . 已知数列
是公比为2的等比数列.
(1)若
,求数列
的前
项和
;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5525b6b2b529e7eaaaf665943732e10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0496f142d8ae5acb06e83526eaa3ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86197f1a38c5aebcd7d7dedf7b8ac19a.png)
您最近一年使用:0次
2 . 已知数列
的前
项和为
,且
是首项为1,公差为2的等差数列.
(1)求
的通项公式;
(2)若数列
的前
项和为
,且不等式
对一切
恒成立,求实数
的取值范围.
![](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/c51f1c6ae196c2564d23a620d2cded7a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/4438efb49eee52ca57c9130fef7ebbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2024-01-03更新
|
1053次组卷
|
5卷引用:海南省海口市海南中学2023-2024学年高二上学期期末考试数学试题
3 . 设数列
的前n项和为
,已知
,且
(
),则下列结论正确的是( )
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2756c3077fda462502fdf831af09106d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
A.数列![]() | B.数列![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
4 . 某果园种植了甲、乙两种蜜桔品种,为给该果园制定蜜桔销售计划,对蜜桔产量进行了预估,从甲、乙两种蜜桔中分别采摘了
个进行单个称重,其质量(单位:克)分布在区间
,
,
,
,
上,并将数据进行汇总整理,得到甲、乙两种蜜桔质量的频率分布直方图如图所示
同一组数据用该区间的中点值作代表
.
(2)视频率为概率,已知该果园乙种蜜桔树上大约有
万个蜜桔等待出售,某水果批发商提出了两种收购方案:
方案一:所有蜜桔均以
元
千克收购;
方案二:质量适中的蜜桔深受消费者青睐,该批发商建议低于
克的蜜桔以
元
千克收购,不低于
克的蜜桔以
元
千克收购,其他蜜桔以
元
千克收购.
请你通过计算判断哪种收购方案能使该果园收益最大.
(3)现采用不放回抽取的方法从甲种蜜桔中随机逐个抽取,直到抽到的蜜桔的质量在区间
内或抽取了
个为止,设抽取的蜜桔个数为
,求随机变量
的数学期望(结果精确到个位).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0711b72603ec671b07f099377e74f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762aed7532094dfc87709c4b3b4fd2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652b8aa0cb0bdce1d8e7ba8304849778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3cd26075fea64e935d0e05ad8f6781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fc138be9688253cbdeae2808eb74ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)视频率为概率,已知该果园乙种蜜桔树上大约有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
方案一:所有蜜桔均以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
方案二:质量适中的蜜桔深受消费者青睐,该批发商建议低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
请你通过计算判断哪种收购方案能使该果园收益最大.
(3)现采用不放回抽取的方法从甲种蜜桔中随机逐个抽取,直到抽到的蜜桔的质量在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762aed7532094dfc87709c4b3b4fd2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadc63e6e33743ce590ed968948a5a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
您最近一年使用:0次
5 . 已知
为等比数列
的前
项和,
,且
,
.
(1)若
为等差数列,求数列
的通项公式;
(2)若
为等比数列,
,求
.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80024fe424904c9dcd25e36b0ae044c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566ddc797ad2d310d4cc3102302951e9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ee9273cc82d57d99a21fb9c4953d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ee9273cc82d57d99a21fb9c4953d46.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ee9273cc82d57d99a21fb9c4953d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f212355b95afc30cea72b4af7536912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2023-12-23更新
|
895次组卷
|
4卷引用:海南省2024届高三上学期一轮复习调研考试(12月联考)数学试题
解题方法
6 . 已知数列
满足
,且对任意正整数m,n,都有
.
(1)求数列
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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74100adb4f563cc8a5209fed9fb0b991.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd1100b5831d9d61fdba9fea833cd9c.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
名校
解题方法
7 . 已知等比数列
是递增数列,且
,
.
(1)求
通项公式;
(2)在
和
之间插入1个数
,使
、
、
成等差数列;在
和
之间插入2个数
、
,使
、
、
、
成等差数列;…;在
和
之间插入
个数
、
、…、
,使
、
、
、…、
、
成等差数列.若
,且
对
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ef35b21da4cd8130642539d8245f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964df3e9308711d7e14fb624b0c25e2f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)在
![](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/e84bbc85887baf2c01afa80b0d5cc24b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84bbc85887baf2c01afa80b0d5cc24b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.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/1a558b61154c775d249113804c1453f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50c4bd1eb1fa1f4fdc8392b59e6b6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a558b61154c775d249113804c1453f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50c4bd1eb1fa1f4fdc8392b59e6b6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3633c588b06d9b188a4a11ce7cd9708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848016fb3db5063e4a51a64f920c7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044f1ac627493f30faee4f13c5a55ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3633c588b06d9b188a4a11ce7cd9708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848016fb3db5063e4a51a64f920c7c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044f1ac627493f30faee4f13c5a55ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5e416f18fe8bd5b7959a1b4b398400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fa5081a87130190c87e15e91a272d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361386446d504a14471b9fd89130f1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解题方法
8 . 已知数列
的前
项和为
,且
.
(1)求
;
(2)若
,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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9ca336a3cfe76e9264572e35c77a48.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2f67d774e914b65b89fe8b92fcca2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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
2023-12-11更新
|
1859次组卷
|
5卷引用:海南省2024届高三上学期高考全真模拟(四)数学试题
海南省2024届高三上学期高考全真模拟(四)数学试题山东省泰安市新泰弘文中学2024届高三上学期第二次质量检测数学试题(已下线)模块五 专题3 期末全真模拟(能力卷1)高二期末(已下线)重难点5-2 数列前n项和的求法(8题型+满分技巧+限时检测)(已下线)2024年高考全国甲卷数学(理)真题变式题16-23
名校
解题方法
9 . 已知等差数列
满足
,
,
且数列
是公比为2的等比数列.
(1)求数列
的通项公式;
(2)若
,记数列
的前n项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc48a0006b0d0879ae94c3f08f041c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437615a39c0eca2da8f5facf4ffe52b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716d6be9fcea44d5327c3e84184cd59e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
名校
解题方法
10 . 在数列中,
,
是
的前n项和,且数列
是公差为
的等差数列.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd10416baf4aedc70516b447f04b757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2023-11-13更新
|
2401次组卷
|
10卷引用:海南省部分学校2024届高三上学期学业水平诊断(一)数学试题
海南省部分学校2024届高三上学期学业水平诊断(一)数学试题重庆市江北区第十八中学2023-2024学年高三上学期11月检测(一)数学试题宁夏石嘴山市平罗中学2024届高三上学期第三次月考数学(理)试题(已下线)第二篇 “搞定”解答题前3个 专题2 数列解答题【练】高三逆袭之路突破90分河北省衡水市安平中学2023-2024学年高二上学期第三次月考数学试题河北省保定市唐县第二中学2024届高三上学期12月月考数学试题(已下线)专题08 数列(5大易错点分析+解题模板+举一反三+易错题通关)四川省凉山州宁南中学2023-2024学年高二上学期期末模拟数学试题(二)四川省凉山州宁南中学2023-2024学年高二上学期期末模拟数学试题(一)(已下线)黄金卷03