1 . 求极限:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bced5b5ec368afde9cb8f52e586178.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bced5b5ec368afde9cb8f52e586178.png)
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解题方法
2 . 数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acca5aa6b2285d897a65c289c1b54ba.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3807b2029d911ee10259ddb1b1549d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acca5aa6b2285d897a65c289c1b54ba.png)
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名校
解题方法
3 . 在等差数列
中,
,公差
,
为
的前
项和.若向量
,
,且
,则
的最小值为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](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/a21280ba3f43d153e482ed3313dc6a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803e1fde18fd1c0a88ca9b1d448b4c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7c5293337201a7ddefe2cd16142e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfd87a768552f521fdc1337375cfc14.png)
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2020-06-26更新
|
366次组卷
|
4卷引用:黑龙江省哈尔滨市第六中学校2019-2020学年高一下学期返校适应训练数学试题
解题方法
4 . 等差数列前10项的和为10,第11项至第20项的和为
,则第21项至第30项的和是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a26ffe14d71235c315c2714bbf9970d.png)
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5 . 已知
,则n的值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f040cec583343ae8a28d68eb25985c.png)
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解题方法
6 . 在等差数列
中,
,记
,则
等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dff84eb9f1f27d86aa45693034491f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aabd537345fb304124ba9fbfa39517b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f907d998b6ca7466948ab5a7ff76c.png)
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解题方法
7 . 已知等差数列
的公差不为零,首项
,
是
和
的等比中项,则数列
的前
项之和是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
您最近一年使用:0次
2020-06-26更新
|
130次组卷
|
2卷引用:沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.3(4)等比数列的求和公式的应用
8 . 将全体正整数排成一个三角形数阵:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b739ebaafa4ef855abb05077735776aa.png)
按照以上排列的规律,第n行
从左向右的第3个数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b739ebaafa4ef855abb05077735776aa.png)
按照以上排列的规律,第n行
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3237f179760e2a152819b5892c294afb.png)
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解题方法
9 . 在等差数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da13d38b5bfe409ad174de50a3faabe.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dff6cad829fcc7bb28adda00a9c6b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da13d38b5bfe409ad174de50a3faabe.png)
您最近一年使用:0次
2020-06-26更新
|
156次组卷
|
2卷引用:沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 阶段训练1
解题方法
10 . 已知数列
满足
,…,则数列
的前n项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd269b0eaa7bf274a31cdef5f36910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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