名校
解题方法
1 . 记等差数列
的前
项和为
,已知
,且
.
(1)求
;
(2)若对于任意的
恒成立,求实数
的取值范围.
![](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/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc867f18403bdac78525e35c31dec8c7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf32dbdd19b75bd2d2820ebad493f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2 . 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)
您最近一年使用:0次
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