1 . 已知
为对称数列,0<d<1,
为数列
的前n项和,若
对一切
则首项
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999976833024/1571999982428160/STEM/d0c2e29eaa5a407f960508013a959939.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999976833024/1571999982428160/STEM/edac098f9fd9467187a2885beec73b83.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999976833024/1571999982428160/STEM/da07d71218eb465298150c6383b9bb66.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999976833024/1571999982428160/STEM/7d4392a8cfaa4c659b2586c273b755d8.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999976833024/1571999982428160/STEM/5c0d172eff5e459e9b48497fc210d6ee.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 如图,在四棱锥
中,底面
是
且边长为
的菱形,侧面
是等边三角形,且平面
底面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999787073536/1571999793012736/STEM/fb5ccc8d-7a54-4b4c-89ed-794fcae382f7.png?resizew=202)
(1)求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b7f92d9ab08250f5050e0b8122aea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1571999787073536/1571999793012736/STEM/fb5ccc8d-7a54-4b4c-89ed-794fcae382f7.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31dfeaf3319821a5ce07e9fe7c5c014.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2016-12-03更新
|
177次组卷
|
3卷引用:2015届河北省衡水冀州中学高三上学期第四次月考文科数学试卷
2014·河北邯郸·一模
3 . 已知椭圆C:
的两焦点与短轴的一个端点的连线构成等腰直角三角形,直线
与以椭圆C的右焦点为圆心,以![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/ba4907cd4bf94998bfa5017d2a9af18b.png)
为半径的圆相切.
(1)求椭圆的方程.
(2)若过椭圆
的右焦点
作直线
交椭圆
于
两点,交y轴于
点,且
求证:
为定值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4c9d22ff6c1bb58c4313a40018d612.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/fc711e1d0bee47a6af394f18388bec0a.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/ba4907cd4bf94998bfa5017d2a9af18b.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/24b5f1b34bad4c519c7b4d865b903d0a.png)
(1)求椭圆的方程.
(2)若过椭圆
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/fdeb438257484a6a88e432ae7fa3726e.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/fb74256e4d474522954054da736f01f8.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/fdd1eadef8284dad8cf944ba833f44f2.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/789928dbab194dc1836cf520c4e4f436.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/2652f1f9673344ed9c5c1504d9fc3e18.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/e445961db8ec4cc397e8857908c1eb58.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/e16d7d04cd6348ab9d247047f824230d.png)
![](https://img.xkw.com/dksih/QBM/2014/10/17/1571879420559360/1571879426244608/STEM/1fa2b2a05a04491a8c84b62b3775a422.png)
您最近一年使用:0次
4 . 已知
分别为椭圆
:
(
)的左、右焦点, 且离心率为
,点
椭圆
上
(1)求椭圆
的方程;
(2)是否存在斜率为
的直线
与椭圆
交于不同的两点
,使直线
与
的倾斜角互补,且直线
是否恒过定点,若存在,求出该定点的坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/1dcba6f1145449b59f77448a2ac8a6d6.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/492495623f0f4599824e6f3e7d1bb5ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/9759a27a0d7c404db9aa04e14c8a2a9b.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/90d69f0b0db94e93b5a1395ecf20e116.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/b26f7b7fd2b749f49653e57e1e75ae1d.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/492495623f0f4599824e6f3e7d1bb5ac.png)
(1)求椭圆
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/492495623f0f4599824e6f3e7d1bb5ac.png)
(2)是否存在斜率为
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/f7dc0ab74cf74e1896567a9d2afac21b.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/4d304bbf154241b2aa0500f07b74ad6a.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/492495623f0f4599824e6f3e7d1bb5ac.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/288571fa52694cfb95f622d6ec5c4626.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/645c62af347445eab00696e1a20b0e0c.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/73927bf9264540fe8225b9a192576c0a.png)
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571954303672320/1571954309218304/STEM/4d304bbf154241b2aa0500f07b74ad6a.png)
您最近一年使用:0次
10-11高一上·河北唐山·期中
5 . 已知二次函数
的二次项系数为
,且不等式
的解集为
.(Ⅰ)若方程
有两个相等的根,求
的解析式;
(Ⅱ)若
的最大值为正数,求
的取值范围.
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/5afd8ccce8df4366a0a2efd33148fe40.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/e35b1eb760fe47899e1317ef73ebcd1f.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/fd769518d35c4298aa6b758338254039.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/1228d6aee4ff46eeb1260660fbc06218.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/8f9828c5819c4cfe9feacf27b3cdcdbe.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/5afd8ccce8df4366a0a2efd33148fe40.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/5afd8ccce8df4366a0a2efd33148fe40.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838900224/STEM/e35b1eb760fe47899e1317ef73ebcd1f.png)
您最近一年使用:0次
14-15高三上·上海浦东新·期末
名校
6 . 已知实数
,函数
.
(1)当
时,求
的最小值;
(2)当
时,判断
的单调性,并说明理由;
(3)求实数
的范围,使得对于区间
上的任意三个实数
,都存在以
为边长的三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b175d77d4b04efe6a41b0b902220e5.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6946bc9bf97463991c16107eb4e9542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/409e498aa19b4a6aa8ad728a20b0d7a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a54029c7a4cfca5018e5c3fe69ecb69.png)
您最近一年使用:0次
2016-12-03更新
|
2867次组卷
|
8卷引用:2015-2016学年河北定州中学高一上学期周练一数学试卷
2015-2016学年河北定州中学高一上学期周练一数学试卷2016-2017学年河北定州中学高二承智班上周练四数学试卷(已下线)2014届上海市浦东新区高三上学期期末考试(一模)理科数学试卷(已下线)2014届上海市浦东新区高三上学期期末考试(一模)文科数学试卷(已下线)2014届上海华师二附中高三上学期期末考试文科数学试卷安徽省安庆市桐城中学2019-2020学年高一上学期第一次月考数学试题上海市沪新中学2021届高三上学期十月月考数学试题上海市复兴高级中学2022届高三下学期3月练习数学试题
真题
名校
7 . 已知函数
,其中
,
为自然对数的底数.
(Ⅰ)设
是函数
的导函数,求函数
在区间
上的最小值;
(Ⅱ)若
,函数
在区间
内有零点,求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7fcfc9057b746972bce4d14c8e7538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057db09504e1a3e62cd7fc678a7c31ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632e88f116c6097af475a688705cfd14.png)
(Ⅰ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196be101149acfb6a6c4ceca7fc96828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2016-12-03更新
|
7990次组卷
|
22卷引用:2020届河北省衡水中学高三下学期一调考试数学理科试题
2020届河北省衡水中学高三下学期一调考试数学理科试题2014年全国普通高等学校招生统一考试理科数学(四川卷)(已下线)2013-2014学年江西省上高二中高二下学期期末考试理科数学试卷2015届新疆师范大学附属中学高三12月月考理科数学试卷12015届新疆师范大学附属中学高三12月月考理科数学试卷22015届甘肃省河西三校普通高中高三上学期第一次联考理科数学试卷2015-2016学年重庆市八中高二下期中理科数学试卷(已下线)2019高考备考一轮复习精品资料【理】专题五 函数的单调性与最值 教学案(已下线)2019高考备考一轮复习精品资料 【理】专题十五 导数的综合应用 教学案【全国百强校】北京市第八十中学2019届高三10月月考数学(文)试题(已下线)2019高考热点题型和提分秘籍 【理数】专题5 函数的单调性与最值 (教学案)(已下线)2019高考热点题型和提分秘籍 【文数】专题11 导数的应用 (教学案)(已下线)2019高考备考二轮复习精品资料【文数】-专题2 函数的图像与性质(教学案)陕西省渭南市韩城市2018-2019学年高三下学期期中数学(理)试题宁夏回族自治区银川市第二中学2019-2020学年高三上学期统练四数学(理科)试题2020届西大附中高三12月月考数学(理)试题山东省潍坊市四县市2021届高三5月联考数学试题山东省日照市2021届高考数学模拟训练数学试题江苏省南通市海安高级中学2021-2022学年高三上学期10月三校联考数学试题(已下线)第14讲 零点问题之取点技巧-突破2022年新高考数学导数压轴解答题精选精练江苏省宿迁、海安、句容中学2021-2022学年高三上学期期中联考数学试题(已下线)专题22 导数解答题(理科)-2
8 . 已知函数
,
.
证明:(1)存在唯一
,使
;
(2)存在唯一
,使
,且对(1)中的
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a8c0bb5c9abc43030df425e06e510a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503d6cf7dae65c38397e7376852ddcb6.png)
证明:(1)存在唯一
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e7af462cb34eaef834e358b29ec776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f34d440343370918f1e4d6770bcc2a.png)
(2)存在唯一
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb559ecde7be2f0cce001522877121d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b56c2179dd91d69cdd790bebd54858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d5dff1e3ad54c5a73c9949ce5aeb06.png)
您最近一年使用:0次
2016-12-03更新
|
3848次组卷
|
9卷引用:河北省唐山市第一中学2021届高三三轮复习十连考(二)数学试题
河北省唐山市第一中学2021届高三三轮复习十连考(二)数学试题2014年全国普通高等学校招生统一考试理科数学(辽宁卷)(已下线)2020届天津市河东区高三高考一模数学试题(已下线)第九章 导数与三角函数的联袂 专题四 利用导数证明含三角函数的不等式 微点2 利用导数证明含三角函数的不等式(二)(已下线)第九章 导数与三角函数的联袂 专题四 利用导数证明含三角函数的不等式 微点3 利用导数证明含三角函数的不等式(三)宁夏银川市唐徕中学2023-2024学年高三上学期期中考试数学(理)试题(已下线)模块三 大招25 不等式证明——指对处理(已下线)模块三 大招6 不等式证明——指对处理(已下线)专题22 导数解答题(理科)-2
13-14高三·全国·课后作业
9 . 若不等式
对一切正整数
都成立,猜想正整数
的最大值,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfdc54894a3bb3314886878cb492842a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2011·江西·三模
10 . 已知椭圆
的离心率为
,以原点为圆心,椭圆的短半轴长为半径的圆与直线
相切.
(1)求椭圆
的方程;
(2)若过点
的直线与椭圆
相交于两点
,设
为椭圆上一点,且满足
(
为坐标原点),当
时,求实数
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447cf8fad38594b2c8863e20168e1ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc493a0ad349b89d41f9be3ae357d82.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de99c9c20ad2883a905320eaf5bf0179.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6c84e127366a8840b6720a9dacd8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb32ef8c72acd3c7b144af485c39835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2016-12-03更新
|
1452次组卷
|
12卷引用:2011-2012学年河北省正定中学高二第一学期期末考试理科数学试卷
(已下线)2011-2012学年河北省正定中学高二第一学期期末考试理科数学试卷(已下线)2013-2014学年河北省正定中学高二上学期期末数学试卷河北省石家庄市正定中学2023-2024学年高二上学期期末数学试题(已下线)2011届江西省师大附中高三第三次模拟理科数学试题(已下线)2011-2012学年辽宁省瓦房店市高级中学高二上学期期末理科数学试卷(已下线)2011-2012学年辽宁省瓦房店市高级中学高二上学期期末考试文科数学(已下线)2012届山西省四校高三第三次联考考试理科数学试卷(已下线)2012届山东省冠县武训高中高考模拟预测数学文试卷(已下线)2012届黑龙江省哈六中高三第三次模拟考试理科数学试卷(已下线)2014届辽宁省抚顺市六校联合体高三上学期期中考试理科数学试卷(已下线)2014年吉林省延边州高考复习质量检测理科数学试卷(已下线)2013-2014学年新疆兵团农二师华山中学高二下学期期中理科数学试卷