解题方法
1 . 已知
,
.
(1)当
时,求
的最小值;
(2)当
时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a9344f4fca7b9779ca7720e5277ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374286d99e3a59a5606853efb2c06ad8.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62cd2a82636026979100c3facd172195.png)
您最近一年使用:0次
名校
2 . 已知数列
满足
,则
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd9d66166dfb06c9850f3adbed3e392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
2024-02-17更新
|
514次组卷
|
2卷引用:山西省长治市2023-2024学年高二上学期1月期末数学试题
解题方法
3 . 已知数列
的前
项和为
,且满足
,
,若
,则
( )
![](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/677c103bf88678449276b8944de2fec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294047485c7ba2db341ef178dafe5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f67e6f9f75fe5e80873eac20abc83b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
A.15 | B.16 | C.17 | D.18 |
您最近一年使用:0次
解题方法
4 . 已知
是公差不为零的等差数列,
,且
,
,
成等比数列.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](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/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e042d7b097991b97e003668c36723969.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)
您最近一年使用:0次
5 . 有理数都能表示成
(
,
,且
,
与
互质)的形式,于是有理数集可表示为
.任何有理数
都可以化为有限小数或无限循环小数.反之,任一有限小数也可以化为
的形式,从而它是有理数.对于无限循环小数
,它可以表示成
,这是数列
的无穷项和,记为
.设该数列的前
项和为
,经计算得
,当
趋于无穷大时,
趋于0,则
,即可得
.
(1)数列
的无穷项和是有限小数吗?请说明理由;
(2)
是有理数吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00cb345f4f5412cc958e4f2085e8f571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b2400d72b1e3145cb21ba719d8a968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230e0a440b8889447f016ae8e3ab6177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b4464ed7fbac5ee80445dfdeb21c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2b130c67213517e483f1286988414b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc4a96a7601995efe5b7891966cdb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.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/de4da73ba2be55c716b1104cae2ceeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd56eb9d6ca68d288c232e59847ddf63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a52efd70c382a8322f7dede588fa66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc8ff3a0d73bf02f4bb5163f730b203.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3b9101b74e00ffcba4a99e40a8e521.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b0d5cf741c9fe8a0cfcf6cdbcd90ce.png)
您最近一年使用:0次
6 . 已知数列
满足
,
,若
成立,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b12f3b37b0807d27d94f2b3787226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60bab36e7228f7de5294d39590b8b947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.7 | B.8 | C.9 | D.10 |
您最近一年使用:0次
2024-01-25更新
|
843次组卷
|
4卷引用:山西省长治市2023-2024学年高二上学期1月期末数学试题
山西省长治市2023-2024学年高二上学期1月期末数学试题广东省中山市中山纪念中学2024届高三上学期第二次调研数学试题湖南省株洲市第二中学2024届高三上学期第一次调研数学试题(已下线)第五章:数列(单元测试)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第三册)
名校
解题方法
7 . 已知
,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e482dd69ac1cf7f06552fdf25a217c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8fe271e87098be9f9a139cb8eca7c6.png)
您最近一年使用:0次
2023-11-26更新
|
130次组卷
|
5卷引用:山西省长治市部分学校2023-2024学年高一上学期11月质量检测数学试题
解题方法
8 . 已知
克糖水中含有
克糖
,再添加
克糖
(假设全部溶解),糖水变甜了,
(1)请将这一事实表示为一个不等式,并证明这个不等式成立;
(2)运用该不等式比较以下三个值的大小:
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b37253262ce9d07748ed45a55156e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cc24b575f4fd1ea7fe8ce5612fa9a.png)
(1)请将这一事实表示为一个不等式,并证明这个不等式成立;
(2)运用该不等式比较以下三个值的大小:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4096ebda06e298e48c475986932e4829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffec753023052aed6a1f2137a5b6b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99fb2fd79381a4b8815cf115e14ac5c7.png)
您最近一年使用:0次
解题方法
9 . 在
中,角
的对边分别为
,已知
,
,且
.
(1)求
;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b5e49102150ea3570b9f2b983ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885541dcac051db2f04a064e18153ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6e4074f6943b3cfe04a427cb8e8bdf.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-07-05更新
|
816次组卷
|
4卷引用:山西省长治市2022-2023学年高二下学期期末数学试题
10 . 对于一个
项数列
,记
的“Cesaro平均值”为
,若数列
的“Cesaro平均值”为2022,数列
的“Cesaro平均值”为2046,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ede53a4a0389cb12dca0742de7e10b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ef7e1edfb70df79e5fc9945b0a200e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9c7d2f037aa5faa4867a335c4644bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55a09f14d2a608a3abd501dd93e5ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
A.24 | B.26 | C.1036 | D.1541 |
您最近一年使用:0次