名校
解题方法
1 . 已知
是递增的等差数列,
且
.
(1)求数列
的通项公式;
(2)设
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad58678605cc592f11e2eb426dd3f3e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef910998694cb9459c3795dd426208c3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2227fd9a38f9dd58b7524e16527b6c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-03-26更新
|
339次组卷
|
3卷引用:内蒙古赤峰市2019-2020学年高二上学期联合考试数学(文)试题
解题方法
2 . 执行如图所示的程序框图,则输出的
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ea76ac57-6a92-4094-ae0c-0bb195755f72.png?resizew=236)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ea76ac57-6a92-4094-ae0c-0bb195755f72.png?resizew=236)
A.14 | B.15 | C.21 | D.28 |
您最近一年使用:0次
名校
3 . 已知点P是椭圆
上的一点,
分别为椭圆的左、右焦点,已知
,且
,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38928a92bc4b44ed3c9b89769f5372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df44ca8a2848775c266c9dce3f9b2ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29aa3bd463abf39a3f63e077abcc28.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-03-24更新
|
781次组卷
|
2卷引用:内蒙古包头市包钢四中2018-2019学年高二下学期4月月考数学(文)试题
解题方法
4 . 已知函数
.
(1)当
时,求函数
的极值;
(2)若
,
恒成立,求实数a的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a420025642017aac718037fda459dba2.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d1d7098035d2ef8b6724942d5fc36f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
您最近一年使用:0次
名校
解题方法
5 . 某种产品的销售价格
元与销售量
件之间有如下的对应数据:
(1)根据上表提供的数据,求出
关于
的线性回归方程;
(2)试根据(1)所得回归方程估计销售价格
为多少时,销售总额最大?(参考公式:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)试根据(1)所得回归方程估计销售价格
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0a110c7d3b1ab2bce342d5f776b470.png)
您最近一年使用:0次
名校
解题方法
6 . 某校举办了一场主题为“爱诗词、爱祖国”的诗词知识竞赛,从参赛的全体学生中抽出30人的成绩作为样本.对这30名学生的成绩进行统计,并按
、
、
、
、
、
分组,得到如图所示的频率分布直方图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/67918c39-bc6b-41cd-b6d9-0157159e5226.png?resizew=247)
(1)求图中实数
的值;
(2)估计参加这次知识竞赛的学生的平均成绩及成绩的中位数(平均成绩用每组中点值做代表,结果均保留一位小数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1720e1256b8eb4fa308d77814edaf197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627a86a6ccc6968f95c9e26db5c4b80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826cd3a88388c3896b1e429fabd437f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58d9a123e465dace224231f54ee94e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a40cf767fd2a684f2f1ed9216836792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a0dc3b0349c53d7bf36dfe97958cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/67918c39-bc6b-41cd-b6d9-0157159e5226.png?resizew=247)
(1)求图中实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)估计参加这次知识竞赛的学生的平均成绩及成绩的中位数(平均成绩用每组中点值做代表,结果均保留一位小数).
您最近一年使用:0次
名校
解题方法
7 . 四面体
的四个顶点都在球
的球面上,
,
,
,且平面
平面
,则球
的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c3f13203c1915b104924f650fe4227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09859f122f6f82f6770d73455b6d3350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
名校
解题方法
8 . 已知
为等差数列
的前
项和,且
,给出下列说法:
①
为
的最大值;②
;③
;④
.其中正确的是______ .
![](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/2f0fb2f484d3d73b26acc02ffdc56a3d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d4688b8b20ecd1c8f6e3fa0b1eab62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce868ac245a30cc99db2b35b2fabc545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b67514a8237b3fe4d0d737fc274b4c4.png)
您最近一年使用:0次
名校
解题方法
9 . 如表定义函数
:
对于数列
,
,
,
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![]() | 1 | 2 | 3 | 4 | 5 |
![]() | 5 | 4 | 3 | 2 | 1 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc5ac1542da56851d19240e723a1530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52f28a846fe3f8365836f5fb69ed111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec3004937aab88c44e66753caab782.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
名校
解题方法
10 . 在
中,内角
、
、
的对边分别为
、
、
,若已知
.
(1)判断
的形状;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa6e5e15565fd0b3a930995e28ee79d.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca69890d870ac9a79fe891ff57396e37.png)
您最近一年使用:0次