1 . 已知数列
和
满足:
,
,
(
为常数,且
).
(1)证明:数列
是等比数列;
(2)①求数列
的通项公式;
②若当
和
时,数列
的前
项和
取得最大值,求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fd4f19859fa547fbacebfa0d33a660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5c9405235478ddadadf0a4bd4601f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472393b18c7880e73b40e31fbe2d951c.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
(2)①求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
②若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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解题方法
2 . 已知
,
,
,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd98ce07e05c58d83a48d90dfcb28fd2.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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3卷引用:河北省秦皇岛市青龙满族自治县部分学校2023-2024学年高一上学期期末数学试题
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解题方法
3 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71edd75f29d41aabcd0348616df101bd.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71edd75f29d41aabcd0348616df101bd.png)
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解题方法
4 . 已知整数数列
是等差数列,数列
满足
.数列
,
前
项和分别为
,
,其中
.
(1)求数列
的通项公式;
(2)用
表示不超过
的最大整数,求数列
的前20项和
.
![](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/f7d3d55a85012933f91c5d8d27d8801d.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05f0e81bece6b6e62960b610cb39f6e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2aadc3f0fa37f39fc9679ef081cb6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa9b9ef8fafe39ef9982a63a82590d0.png)
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2021·全国·模拟预测
名校
解题方法
5 . 如图,四边形
中,
,
,
,
且
为锐角.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882962100731904/2883472789118976/STEM/8d6c099468254f1ab7b5d931a71cb564.png?resizew=139)
(1)求
;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e70a1db3825a701ae8f56eba85e701e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44315d3429e4d76842ecfc14f1ca949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882962100731904/2883472789118976/STEM/8d6c099468254f1ab7b5d931a71cb564.png?resizew=139)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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8卷引用:河北省秦皇岛市昌黎第一中学2024届高三上学期第六次调研考试数学试题
河北省秦皇岛市昌黎第一中学2024届高三上学期第六次调研考试数学试题(已下线)2022届高三普通高等学校招生全国统一考试数学信息卷(六)(已下线)解密08 正、余弦定理及解三角形(分层训练)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(全国通用)(已下线)重难点03 四种三角函数与解三角形数学思想(核心考点讲与练)-2023年高考数学一轮复习核心考点讲与练(新高考专用)(已下线)拓展三:三角形面积(定值,最值,范围)问题(精讲)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)重庆市乌江新高考协作体2022-2023学年高一下学期期末数学试题山东省青岛市青岛第九中学2022-2023学年高一下学期期末数学试题江苏省南京市第一中学2023届高三四模数学试题
名校
6 . 对于函数
,若
满足
,则称
为函数
的一对“类指数”.若正实数a与b为函数
的一对“类指数”,
的最小值为9,则k的值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702e71953f94c5b22d3f07e02e701c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9037ebf8b760a55949b9bce0e644fa98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac42025e439a68768819900999631ed3.png)
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