1 . 已知递增数列
的前n项和为
,且
,
.
(1)求数列
的通项公式;
(2)设
.
(ⅰ)求数列
的通项公式;
(ⅱ)求
.
![](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/e84c2e4a2a86ffc252955c06e9b567e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37b430b94a1afdb43f2a80782627c02.png)
(ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f3d151cbe277608d3a6cfbbe3f5eb9a.png)
您最近一年使用:0次
名校
解题方法
2 . 有n个首项都是1的等差数列,设第m个数列的第k项为
,公差为
,并且
成等差数列.
(1)当
时,求
,
,
以及
;
(2)证明
(
,
,
是m的多项式),并求
的值;
(3)当
,
时,将数列
分组如下:
(每组数的个数构成等差数列),设前
组中所有数之和为
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda60be3ec6a53c2186021809f87d2ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8598379ec01edc16c72c1d3fa3ce81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf101d0cde32b057c21d42a2b336764.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599d18f02ae5e12191a37cd2d886dc93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498d357985304a737e7a01272ebbcf15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4b25db4e5f4a3743476ae088720fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597b1b4a90194fdb88a0a9a3022f5038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f2fa5d1e2f6118ea97b390dcfaf293.png)
(2)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2470082d0a6aa317030c6904f438c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615b5e9149cb77ee71a4684bfd43e98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca4b2f545d6cfd6764ad19c7bc2c2f8.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea6578afabc23f5d7041b88c3790dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8b33cde65d8456d9a56a19f5c1a377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463195d16c135c5aea8fc05fa74a5273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02dfd2fab2d2a804adcfce8ce36f556f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53e88f967e1e79b7fd23bc4af4ac862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb7b05a076e75ba6ca76e758a590e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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名校
解题方法
3 . 若数列
满足
,其中
,则称数列
为M数列.
(1)已知数列
为M数列,当
时.
(ⅰ)求证:数列
是等差数列,并写出数列
的通项公式;
(ⅱ)
,求
.
(2)若
是M数列
,且
,证明:存在正整数n.使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a07614926587f57bc5f341c4f97f4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec574b71bbd7671223f8c833c8c8b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec1a744042c32d0a851f98fafaa81f3.png)
(ⅰ)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115da54f93de5e89d1e7f443fccb61f8.png)
(ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0992722f5002aeafa39d25c6b5f4644b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21085fbd6c4b34588f17fc466c845ffe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a789a9be1723bfbd38ae538a9f39dc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446e8a7985d4d3dd95c70dc4aad67861.png)
您最近一年使用:0次
2024-03-25更新
|
1254次组卷
|
3卷引用:天津和平区2024届高三一模数学试题
4 . 已知等差数列
的前
项和为
,公差为1,且满足
.数列
是首项为2的等比数列,公比不为1,且
、
、
成等差数列,其前
项和为
.
(1)求数列
和
的通项公式;
(2)若
,求正整数
的值;
(3)记
,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/cc87b0223fb15e20ffa231bfbdd90260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502d6855cdd026069a6a7b73f43bc155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce0986eff55247b31f204481297ecef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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/56b10f95645b84b98492620d0b630640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e54fa91d40e7e3aad98c994d73b9a7.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/e15526f7c892333030073b85fc3baee6.png)
您最近一年使用:0次
2022-06-01更新
|
2111次组卷
|
7卷引用:天津市武清区杨村第一中学2022届高三下学期高考第一次热身练数学试题
天津市武清区杨村第一中学2022届高三下学期高考第一次热身练数学试题天津市滨海新区塘沽第一中学2023届高三下学期十二校联考(二)数学模拟试题(已下线)2022年高考天津数学高考真题变式题10-12题(已下线)2022年高考天津数学高考真题变式题16-18题(已下线)4.3.3 等比数列的前n项和-2022-2023学年高二数学《基础·重点·难点 》全面题型高分突破(苏教版2019选择性必修第一册)(已下线)4.3.2.2 等比数列的前n项和的性质及应用(练习)-2022-2023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)专题05数列求和(错位相减求和)
名校
解题方法
5 . 已知数列
满足
,其前5项和为15;数列
是等比数列,且
,
,
,
成等差数列.
(1)求
和
的通项公式;
(2)设数列
的前n项和为
,证明:
;
(3)比较
和
的大小
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b6c85774072d4bb9dc0fcc2f0ab78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bfd0fa5d67b0fc58b2c60d24ddba4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6644fba340c7fe81fe55f6effde570ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](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/9e3d8209cbd7bdf77d503d0f059c2616.png)
(3)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4cbb4329818bcdd4eeda2c28c3a6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd2f03fd712fd04bf9b854ddefba12c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be613fff0421d9be9e8bb5eb8b07c40f.png)
您最近一年使用:0次
2022-04-28更新
|
1452次组卷
|
7卷引用:天津市南开区2022届高三下学期一模数学试题
天津市南开区2022届高三下学期一模数学试题天津市咸水沽第一中学2022届高三下学期高考临考押题卷数学试题(已下线)临考押题卷04-2022年高考数学临考押题卷(天津卷)天津市滨海新区塘沽紫云中学2022-2023学年高三上学期线上期末数学试题(已下线)重组卷01天津市天津经济技术开发区第二中学2023届高三上学期期中数学试题(已下线)考向20等比数列及其前n项和(重点)(学生版) - 2
6 . 已知
为等差数列,
为等比数列,
,
,
.
(1)求
和
的通项公式;
(2)令
,求数列
的前
项和
;
(3)记
.是否存在实数
,使得对任意的
,恒有
?若存在,求出
的取值范围;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fa54e94c891e9d0a87e693f9e17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f061d7de917c07af22bde65907c7d39.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050c9501063924ae4f079245d8e9ff40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e72af37873045f7e7b0199e41c1361f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2021-11-13更新
|
442次组卷
|
2卷引用:天津市北辰区2022届高三上学期第一次联考数学试题
解题方法
7 . 设
是各项均为正数的等差数列,
,
是
和
的等比中项,
的前
项和为
,
.
(1)求
和
的通项公式;
(2)设数列
的通项公式
.
(i)求数列
的前
项和
;
(ii)求
.
![](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/6e0414c0b6fda7fee5eb71976e09da80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0df9231e0359cb84f1714a7a0199f69.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446bfd9d9c4168058f368c83263059db.png)
(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2def5aa62f497709e1bd8258583d62fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8318322c02eec4fc764f82a2f5d9119.png)
(ii)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef83c1651a259600984bc0946de37f85.png)
您最近一年使用:0次
2020-05-27更新
|
3098次组卷
|
6卷引用:2020届天津市河西区高考一模数学试题
2020届天津市河西区高考一模数学试题天津市河西区2023届高三三模数学试题(已下线)2021年高考数学押题预测卷(天津卷)03江苏省南通市2023届高三三模数学模拟试题(已下线)2021年新高考天津数学高考真题变式题16-20题(已下线)专题07 数列-2
名校
解题方法
8 . 数列
是等比数列,公比大于
,前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
,
是等差数列,已知
,
,
,
.
(1)求数列
的通项公式
,
;
(2)设
的前
项和为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
,
(ⅰ)求
;
(ⅱ)若
,证明
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.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/28d82e4c2294efbd33e1b268e9a0cec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b840f977d70d2c0393528b91661c6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb0ae3ee83a722a6ea7774db46661c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d462a9d1eeb119638c72761db74d1690.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.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/28d82e4c2294efbd33e1b268e9a0cec5.png)
(ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2711fcd2e88272be88e0423eec96928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297e437499bcb77a9c5ae6400d6e47cb.png)
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2020-03-19更新
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1286次组卷
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5卷引用:【区级联考】天津市河西区2018-2019学年高三第二学期总复习质量调查(二)数学(文)试题
9 . 设
是等差数列,
是等比数列.已知
.
(Ⅰ)求
和
的通项公式;
(Ⅱ)设数列
满足
其中
.
(i)求数列
的通项公式;
(ii)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1967aa90e732b3e39c1666f8ff4db7e7.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅱ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e8470c2a5aa3708590de468bfd8688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad52924df9291d5d191d18e09374ee1.png)
(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75e0fa828f6148dc4839112042e2a66.png)
(ii)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b259c23959844c0f89c6fa2dcfa9b9a.png)
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2019-06-09更新
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10583次组卷
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40卷引用:天津市十二区县重点学校2023届高三下学期联考(一)考前模拟数学试题
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