解题方法
1 . 设
为数列
的前
项和,
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
__________ ,
的最大值为__________ .
![](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/6bd057c375b21c55b2d45168b7418c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa49d634fb7ffcd5f2ef8f82582facf.png)
您最近一年使用:0次
2024-04-15更新
|
185次组卷
|
2卷引用:山东省大联考2023-2024学年高二下学期3月质量检测联合调考数学试题
名校
解题方法
2 . 已知
是公差为2的等差数列,其前
项和为
,
是
与
的等差中项,则
=______ ;设
,若对![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
,使得
恒成立,则
的取值范围为 ________
![](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/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc29ee719feeedfbc8c529cf11348abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e4ea40fa7843df0595ccf6fec2d13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dac463bbb7375dbf8e2246f9a6f0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68e7d8df5da4e2e5906aafaac298751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2024-01-09更新
|
634次组卷
|
3卷引用:山东省潍坊市昌邑市第一中学2024届高三上学期模拟预测数学试题
3 . 已知等差数列
满足
,
,则数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
________ ;若数列
的前n项和为
,则使
的最大正整数n为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3af4204cbd59c0bc15f5d83b240a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10c12b130a84039712887dd9064d12b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6603814ac39b169453607671158d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9261093be00af4fd03415b2b169260a0.png)
您最近一年使用:0次
名校
解题方法
4 . 已知数列
的通项公式是
.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.那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6858eb5d02248e5cfbf270638956c4fb.png)
______ .按此进行下去,在
和
之间插入
个数
,
,…,
,使
,
,
,…,
,
成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b015a062337f53f85982230860c21255.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7f82f00fe6163833431241820687ab.png)
![](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/1bcd5c11234a01e2b3d2861e9b3a3aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcd5c11234a01e2b3d2861e9b3a3aec.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/a65cdaa89ae90492504808aba2737fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5733622aabd5a8af1ba76716c86b705a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65cdaa89ae90492504808aba2737fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5733622aabd5a8af1ba76716c86b705a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6858eb5d02248e5cfbf270638956c4fb.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/2e5cbc4ff3ff76f59867618361b8a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa76cf9b7e61f025a614dfea37880500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248cbe7c32c92eacf3668e347f07db0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5cbc4ff3ff76f59867618361b8a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa76cf9b7e61f025a614dfea37880500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248cbe7c32c92eacf3668e347f07db0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b015a062337f53f85982230860c21255.png)
您最近一年使用:0次
2023-12-12更新
|
447次组卷
|
5卷引用:山东省枣庄市第八中学2023-2024学年高二上学期学科素养诊断数学试题
山东省枣庄市第八中学2023-2024学年高二上学期学科素养诊断数学试题浙江省强基联盟2023-2024学年高二上学期12月联考数学试卷(已下线)大招11错位相减法(已下线)【练】 专题7 等比数列与等差数列的综合问题(已下线)专题4 数列中插入项、公共项问题【练】(高二期末压轴专项)
名校
解题方法
5 . 已知数列
满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f68dfeca719b1880c918f9a5c0cec5.png)
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89a10d95109e8545aad12854a46dcdb.png)
__________ ;数列
的前20项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc625e19e7ca2b9d097f67a3d472e47.png)
__________ .
![](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/d4f68dfeca719b1880c918f9a5c0cec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cc6bdd50386adcfd80fdb1bb832ae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89a10d95109e8545aad12854a46dcdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc625e19e7ca2b9d097f67a3d472e47.png)
您最近一年使用:0次
2023-12-08更新
|
726次组卷
|
8卷引用:山东省泰安市新泰中学2023-2024学年高二上学期第三次阶段性考试数学试题
山东省泰安市新泰中学2023-2024学年高二上学期第三次阶段性考试数学试题江苏省启东市2023-2024学年高二上学期期中质量监测数学试卷(已下线)模块三 专题3 小题满分挑战练(3) 期末终极研习室(高二人教A版)(已下线)期末精确押题之填空题(40题)-2023-2024学年高二数学上学期《考点·题型·难点》期末高效复习(人教A版2019)(已下线)第四章 数列(单元测试)-2023-2024学年高二数学同步精品课堂(人教A版2019选择性必修第二册)江苏省泰州市泰兴中学2023-2024学年高二上学期阶段测试(三)数学试题(已下线)【练】专题5 分段数列问题(已下线)专题01求数列通项公式9种常考题型归类【好题汇编】-备战2023-2024学年高二数学下学期期末真题分类汇编(北师大版2019选择性必修第二册)
名校
解题方法
6 . 已知数列
的前n项和为
,现将该数列按如下规律排成个数阵:按行排列,第
行有
项,每一行从左到右项数依次增大,记
为该数阵中第
行从左到右第
个数的坐标,则坐标
为对应的数为________ ;
对应的坐标为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c599e7cec6d192fb73218e7882ceca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f1ad18371ec533aeac27cf1fad95c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a195eea52ebe55bbc18cbd4b06a240c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce88126c3cbc88e03d38f56b7da315b6.png)
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7 . 在数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
______ ;
的前40项和为______ .
![](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/59c5567338bd8e339db45a87040bd043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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8 . 如图,某数阵满足:每一行从左到右成等差数列,每一列从上到下成公比相同的等比数列,数阵中各项均为正数,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550427147909013f0491fe8a24d9a5d4.png)
________ ;在数列
中的任意
与
两项之间,都插入
个相同的数
,组成数列
,记数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4331b9fb70a31f8f02b003eea6054c4e.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f75e8a3038e0c054a23817196079209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e9bee3a8f1a37ac6c60ae8796027eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550427147909013f0491fe8a24d9a5d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6fd28652117b5c5c61d9032bf78f259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f867d0ca7748f1d788aa81ebaf9bb3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f91e65e0726d85ac43389dc345abda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ea71117a2bf34302a0d2017e1c60e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c75f960d4e68b4405a28cae0eaceda1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4331b9fb70a31f8f02b003eea6054c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb936f339f336ed6cc820b803dbd9caf.png)
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9 . 设数列
是以
为首项,
为公比的等比数列,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n个数
,
,…,
,使
,
,
,…,
,
成等差数列.则
=_______ ;令
,则
=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](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/1bcd5c11234a01e2b3d2861e9b3a3aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcd5c11234a01e2b3d2861e9b3a3aec.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/a65cdaa89ae90492504808aba2737fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5733622aabd5a8af1ba76716c86b705a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65cdaa89ae90492504808aba2737fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5733622aabd5a8af1ba76716c86b705a.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/2e5cbc4ff3ff76f59867618361b8a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa76cf9b7e61f025a614dfea37880500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248cbe7c32c92eacf3668e347f07db0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5cbc4ff3ff76f59867618361b8a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa76cf9b7e61f025a614dfea37880500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248cbe7c32c92eacf3668e347f07db0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5733622aabd5a8af1ba76716c86b705a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87fc39fc53c1603ef8ca571ee8d125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bca9c3219d1a9775734b694a404de1d.png)
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10 . 已知等差数列
,
,公差
,
为前n项和,且
.
(1)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3997ac9dacf1c99a7ac41c8da4fe8bc.png)
________ (用t表示).
(2)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3997ac9dacf1c99a7ac41c8da4fe8bc.png)
________ (用t表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9efeb4455e30293d412938eeea85d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9ab92fe26548c0c2bbf3494427e80d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca363fa4c3b09b77d5872fa07579934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3997ac9dacf1c99a7ac41c8da4fe8bc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164ca1533da539dbd84cb1c7951f1f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3997ac9dacf1c99a7ac41c8da4fe8bc.png)
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