1 . 已知函数
.
(1)求证
为定值;
(2)若数列
的通项公式为
(
为正整数,
,
,
,
),求数列
的前
项和
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a295c9e7c191502399bb60db40f91833.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3caaf39cc15fc52ecae71ac5bc0e1c5.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ea3e5a058882fef293a922ae806296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1752474698cd5466dd180df0a00ba9c.png)
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2 . 某企业从2011年开始实施新政策后,年产值逐年增加,下表给出了该企业2011年至2021年的年产值(万元).为了描述该企业年产值
(万元)与新政策实施年数
(年)的关系,现有以下三种函数模型:
,
(
,且
),
(
,且
),选出你认为最符合实际的函数模型,预测该企业2024年的年产值约为( )(附:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f16e835223fc827dbf0adb7fe81e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d586e481f28d2b5f11c0c2cf58e24b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91aa4d06b74cc92610d81f0933df8136.png)
年份 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 |
年产值 | 278 | 309 | 344 | 383 | 427 | 475 | 528 | 588 | 655 | 729 | 811 |
A.924万元 | B.976万元 | C.1109万元 | D.1231万元 |
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3 . 若幂函数
图象过点
,且
,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f98703a94efdf092738b9b9cc431b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262fa61952129ea32681b6e292fbc235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775884ab885f86e674eeeb5b37dc7b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 函数
(
,且
)恒过的定点是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2070abf71953a1b5a7be4240879ce68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
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解题方法
5 . 已知函数
(
,且
)在
上的最大值与最小值之和为20,记
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da53929a8f67b9aa3827fdbd73ebd265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7242b2ab643f9470da77e29d043b893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5e4d2f268d3e873acaeacb1f47ea54.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3caaf39cc15fc52ecae71ac5bc0e1c5.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f1b8b5b13a3422465c842d6505ce7.png)
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6 . 下列运算正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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7 . (1)计算
;
(2)已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f69f79b6ccde29891c99f1b22832273.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591227ef86c86c545d8298f38288dae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0666cbe081eb4ae1c2e4fd96b1cdc37.png)
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8 . 计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1e9cf41c48b236652800e6f0d210fe.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1e9cf41c48b236652800e6f0d210fe.png)
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9 . 计算下列各式的值:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9009ad0cb4d775496fb5337015738005.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f417da2e6a8adee0017d0c649227763.png)
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10 . 数列
,
,
,
,
的一个通项公式是an=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29be23f689eb01e57963495377501257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6e255850b7696035ce346404035814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c072f56b849619c68671f08f5eda5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bc95818fadfb11d72924a103d7e955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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