解题方法
1 . 已知数列
的通项公式为
,其前
项和为
,设
,则数列
的最大项的值与最小项的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f3c4aeeb82e6570cb17d56c83b4ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1513e5da6c411974392997cc9db3768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c576f6b657c8d114ba73feb03b710f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eded65284816fdf6bf335b0c2a78e6a.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4dd2bebad77f7197b487cda2c65faf0.png)
若数列
满足
,且
是递减数列,则实数a的取值范围是 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4dd2bebad77f7197b487cda2c65faf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228862e42f40e6aaa6fe7aaf15d82333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d03bb68dd9ab0416501c066f3b7e4548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知
,那么数列
是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df30aac00b4936fc8b22b8c16287a663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065054f4e163585d630aa42cb6323a3e.png)
A.递减数列 | B.递增数列 |
C.常数列 | D.摆动数列 |
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4 . 数列
是一个单调递增数列,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22f8b0ff2b96ad204e8498930616160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 若
是正项递增等比数列,
表示其前
项之积,且
,则当
取最小值时,
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae8df70a93a368f2f0703e8b83ecfbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.9 | B.14 | C.19 | D.24 |
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6 . 已知等比数列
是递增数列,![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/8518ab3db34242c2921470dc3810561a.png)
,数列
满足
,且
(
)
(1)证明:数列
是等差数列;
(2)若对任意
,不等式
总成立,求实数
的最大值.
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/e9acf453d20b44419b2376d1874de467.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/8518ab3db34242c2921470dc3810561a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/370dc3d8b83c4ba3a17e5be47d047362.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/a079cf51564044a1897c6b788f33c01a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/2e352dcfde00498485e5cf2b6c19e0e2.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/b68fd6dce7ee4aceba86ac8bf374fdc1.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/a5e445f8dc76427cb12d1e3186357bba.png)
(1)证明:数列
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/10a009c70d084049b471e0abe4add88a.png)
(2)若对任意
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/a5e445f8dc76427cb12d1e3186357bba.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/e81d30b3f92d43a88672ab43223d1351.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273900298240/1572273906180096/STEM/0552addd6f4b45b2920cb93f6dcb256a.png)
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7 . 如果一个实数数列
满足条件:
(
为常数,
),则称这一数列 “伪等差数列”,
称为“伪公差”.给出下列关于某个伪等差数列
的结论:
①对于任意的首项
,若
则这一数列必为有穷数列;
②当
时,这一数列必为单调递增数列;
③这一数列可以是一个周期数列;
④若这一数列的首项为1,伪公差为3,
可以是这一数列中的一项;
⑤若这一数列的首项为0,第三项为-1,则这一数列的伪公差可以是
.
其中正确的结论是________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefdef1490b9a57916b6fa249d8926d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
①对于任意的首项
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8bbb4a09e0ac86bbae46222a90841.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b177dbff01bdc85b90b0947ddefd33a.png)
③这一数列可以是一个周期数列;
④若这一数列的首项为1,伪公差为3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071ff10740d0ef09e9b6ab0bf8a92283.png)
⑤若这一数列的首项为0,第三项为-1,则这一数列的伪公差可以是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea677602592c01538ecb303619d24fe.png)
其中正确的结论是
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8 . 我们把一系列向量
按次序排成一列,称之为向量列,记作
,已知向量列
满足:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0605d93f56eebf6f20df7d12f60a4b.png)
.
(1)证明:数列
是等比数列;
(2)设
表示向量
与
间的夹角,若
,对于任意正整数
,不等式
恒成立,求实数
的范围
(3)设
,问数列
中是否存在最小项?若存在,求出最小项;若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8f29baa5b51c3a590a9d1293573a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a38e5d6578eccec4d2da37de80b885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a38e5d6578eccec4d2da37de80b885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087af434bb9df4c28b96fdf0783bd080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0605d93f56eebf6f20df7d12f60a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16c067abe5852f5fe0ebd2a46b4c552.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ffa8be5a02790c6161c56b8e90db64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56be493b67953d5800a3e4a3166b4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1899ef8c31d8ff1949a00e75b7228b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e3fde07e9d6c27f3404da487d8bb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f2b502db3e2994c5a510ea82281934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c370af362fca8f999169eafce599ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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9 . 数列
首项
,前
项和
与
之间满足
.
(1)求证:数列
是等差数列;并求数列
的通项公式;
(2)设存在正数
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e30b34d3ef33337e769109bcdcc381.png)
对任意
都成立,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4a643e34e4fe80e2e44d73798bb50e.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad83668ff336589f82a2cd04db9f9947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设存在正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e30b34d3ef33337e769109bcdcc381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbcd2d3551aaddbc071957c721ac0d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
10 . 若
是正项递增等比数列,
表示其前n项之积,且
,则当
取最小值时,n的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abfa62fd3bcbaf6d9ec1c60a04a83b02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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