1 . 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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2016-12-03更新
|
1504次组卷
|
2卷引用:2014-2015学年湖南衡阳市八中高一下学期期末考试数学试卷
解题方法
2 . 某市现行出租车收费标准如下:不考虑其他因素下,每次运行起步价为(包括燃油附加费在内)4里内5元(不含4里),满4里后的续程运行价为每里跳表计费1元.
(1)若某乘客坐出租车行驶了
(
)里,他应付给司机的费用(元)记作
,求
(
)的表达式.
(2)令
,构造函数
,
,若对任意
,都有
恒成立,试求
的取值范围.
(1)若某乘客坐出租车行驶了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c80bed061fb3b6383f84e442d4f0e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209a7f6233897f8d7e47a8cea8151ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5818ede14d21f6df9ef9c2bfe09286c.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64cf2f0a2cdcda21ad3b28e6ce170fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfc249f6433d3c0aa763f4411cada04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4758dbbe2a8483717cac7062c6a85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4758dbbe2a8483717cac7062c6a85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb6997365e4b65d19b23260e59087d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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11-12高三下·湖南郴州·阶段练习
3 . 已知f(x)=
(m为常数,m>0且m≠1).设f(a1),f(a2),…,f(an)…(n∈N)是首项为m2,公比为m的等比数列.
(1)求证:数列{an}是等差数列;
(2)若bn=an·f(an),且数列{bn}的前n项和为Sn,当m=2时,求Sn;
(3)若cn=f(an)
f(an),问是否存在m,使得数列{cn}中每一项恒小于它后面的项?若存在,求出m的范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83ee69b8d5b09787748481885ce2edc.png)
(1)求证:数列{an}是等差数列;
(2)若bn=an·f(an),且数列{bn}的前n项和为Sn,当m=2时,求Sn;
(3)若cn=f(an)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679b113dabc828a9b67d442f9bb1b77e.png)
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2011·江西宜春·三模
名校
解题方法
4 . 设
是数列
的前
项和,点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40973a319edfa68c949642f85ebef985.png)
在直线
上.
(1)求数列
的通项公式;
(2)记
,数列
的前
项和为
,求使
的
的最小值;
(3)设正数数列
满足
,求数列
中的最大项.
![](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/40973a319edfa68c949642f85ebef985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e12deb498612ac7e12767d4d7b61edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea05a2396e436b4df62d6328dbeaddc.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae901fca2ec1d40ae9cc5eec669630bb.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5957e1527ad78d537bc2cec330590f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)设正数数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ed608ea8cd09662122f2818fd4b829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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