1 . 已知数列
的前n项和为
,
,其中
.
(1)求数列
的通项公式;
(2)设
,数列
的前n项和
,若对任意
且
,
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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a61861d35775e5244a2e0caca3fe472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3940271a9bf4b2f154e106e5665a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab53e53585a516168d2433fc8dd3da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2024-03-06更新
|
769次组卷
|
2卷引用:山西省运城市2023-2024学年高二上学期期末调研测试数学试题
2 . 如图,在直四棱柱
中,
,
与
相交于点
,
,
为线段
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/eb841b57-67e6-4e7b-a827-5af6172e5c70.png?resizew=183)
(1)求证:
平面
;
(2)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b6025e5e657a79745b981d2692f951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d128e70cf0a464073703b1ea4e18d999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc2d8c1df01a48f28f64c1ad368555f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/eb841b57-67e6-4e7b-a827-5af6172e5c70.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae7bf236e8637182a1553ce36bd9c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e975f6c9fafab8fd7639dc0cd0f70a4.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e975f6c9fafab8fd7639dc0cd0f70a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
您最近一年使用:0次
解题方法
3 . 已知正四棱锥
的底边长为2,高为2,且各个顶点都在球
的球面上,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.直线![]() ![]() ![]() |
B.平面![]() ![]() ![]() |
C.球![]() ![]() |
D.球心![]() ![]() ![]() |
您最近一年使用:0次
4 . 已知函数
.
(1)证明:
;
(2)设
,求证:对任意的
,都有
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bba0b8ca5aeae32b8a8c03123ae2f65.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa18838a13fda4e45612c32cdf98b71.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa662f0273f0921c1fa4727f632395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b7c58e271f5931c127f2caf572a261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fee6e7b28e3954a3130a37b2a0a38e.png)
您最近一年使用:0次
解题方法
5 . 已知
为双曲线
的左、右焦点,
为平面上一点,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef0bbcebb99f9c5a5b94994c98d64b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce67f2138e7295cd72d66b2908cb6de.png)
A.当![]() ![]() ![]() |
B.当点![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() ![]() ![]() |
D.当点![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2024-03-03更新
|
374次组卷
|
3卷引用:山西省2023-2024学年高二上学期1月期末质量检测数学试题
名校
6 . 已知函数
,且
为极值点.
(1)求实数
的值;
(2)判断
是极大值点还是极小值点,并分别求出极大值与极小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf01bea8f990d27cf68303638b982cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde84fe5599f954da211908c42d3b63.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde84fe5599f954da211908c42d3b63.png)
您最近一年使用:0次
2024-03-03更新
|
582次组卷
|
7卷引用:山西省2023-2024学年高二上学期1月期末质量检测数学试题
山西省2023-2024学年高二上学期1月期末质量检测数学试题山西省朔州市怀仁市大地学校高中部2023-2024学年高二下学期第四次月考(6月)数学试题(已下线)6.2.2 导数与函数的极值、最值(2知识点+6题型+强化训练)-【帮课堂】2023-2024学年高二数学同步学与练(人教B版2019选择性必修第三册)北京市陈经纶中学2023-2024学年高二下学期4月期中诊断数学试卷青海省海东市第一中学2023-2024学年高二下学期第一次月考数学试题湖北省孝感方子高级中学2023-2024学年高二下学期3月月考数学试题 (已下线)专题01 一元函数的导数及其应用-3
7 . 2023年7月31日国家统计局发布了制造业采购经理指数(PMI)如下图所示:
A.从2022年7月到2023年7月,这13个月的制造业采购经理指数(PMI)的极差为![]() |
B.2023年7月份,制造业采购经理指数(PMI)为![]() |
C.从2023年1月到2023年7月,这7个月的制造业采购经理指数(PMI)的第71百分位数为![]() |
D.从2022年7月到2022年12月,这6个月的制造业采购经理指数(PMI)的平均数约为![]() |
您最近一年使用:0次
解题方法
8 . 已知椭圆
的左右顶点分别为
,长轴长为
,点
在椭圆
上(不与
重合),且
,左右焦点分别为
.
(1)求
的标准方程;
(2)设过右焦点
的直线
与椭圆
交于
两点,当
的面积最大时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8413883a9060ffb420b0b66ed65451c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设过右焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ea1c3fe8431260ecb8dffcdae8d570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
解题方法
9 . 设抛物线
的焦点为
,准线为
,点
是抛物线
上不同的两点,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d939b804513036cd96fddce791ece09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefa44964db83759aff6fc8dd7ef8f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e1bc08cc69d3d8e73b990f1236ed5c.png)
A.![]() | B.以线段![]() |
C.线段![]() | D.线段![]() ![]() ![]() |
您最近一年使用:0次
10 . 如图,多面体
由正四面体
和正四面体
组合而成,棱长为
.
(1)证明:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c9303278abd92b7d696727c540c703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bf01006f888d50f60b0735eab922c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/521bc74c-d84e-41fb-a726-59f5d31ab16b.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e2bd8134f694c7594c0a4f61b73ae3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d4aca03910382accfe738520daf689c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次