名校
1 . 已知数列{
}的前n和
,且
,则
的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef9a8407029d3109a91dda8edfcca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d137eb2027f035fa1a36cfcec0626c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
名校
解题方法
2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8891b2ddf7ba62940c6bd7f2b74d45.png)
(1)若
在定义域上单调递增,求实数m的取值范围;
(2)当
时,对于函数
,满足方程
有两个不同的实数根
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8891b2ddf7ba62940c6bd7f2b74d45.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf64c68eff81cab01cb907e47e7c485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65a6297d1182396e0721afa0ea71172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19c4f2ab430c6ffb9ac70ce2a28c33a.png)
您最近一年使用:0次
2022·江苏盐城·三模
名校
解题方法
3 . 如图,在以P,A,B,C,D为顶点的五面体中,四边形ABCD为等腰梯形,
,
,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977941886689280/2978408188436480/STEM/7cd76ffa-509f-4ba9-8028-afb01bc5994f.png?resizew=177)
(1)求证:平面
平面
;
(2)若二面角
的余弦值为
,求直线PD与平面PBC所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47ad7ef0a17747fc54fe058bcb8d1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977941886689280/2978408188436480/STEM/7cd76ffa-509f-4ba9-8028-afb01bc5994f.png?resizew=177)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479b251fdb01bae6d16abb7f2d694a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
您最近一年使用:0次
2022-05-13更新
|
1866次组卷
|
4卷引用:安徽省亳州市蒙城县第八中学2021-2022学年高一下学期期末数学试题
安徽省亳州市蒙城县第八中学2021-2022学年高一下学期期末数学试题(已下线)江苏省盐城市2022届高三下学期三模数学试题江苏省镇江市扬中市第二高级中学2023届高三下学期考前模拟数学试题江苏省南通市海安高级中学2022-2023学年高二下学期期中数学试题
名校
4 . 设函数
.
(1)若
,求
的单调区间;
(2)若
在区间
单调递增,求整数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb202226f1c38435c43ab32cd326a03.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879234adbae93aa72b7e101b3738d4e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2022-04-19更新
|
430次组卷
|
2卷引用:安徽省亳州市第一中学2021-2022学年高二下学期4月月考数学试题
名校
解题方法
5 . 设一组样本的统计数据为:
,其中n∈N*,
.已知该样本的统计数据的平均数为
,方差为
,设函数
,x∈R.则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7b62cd7388984879b781f08bcbe5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015381e925eaf7d927f52184a4c93437.png)
A.设b∈R,则![]() ![]() |
B.设a∈R,则![]() ![]() |
C.当x=![]() ![]() ![]() |
D.![]() |
您最近一年使用:0次
2022-04-19更新
|
1620次组卷
|
3卷引用:安徽省利辛县第一中学2023-2024学年高三上学期第23次限时练数学试题
名校
6 . 已知函数
.
(1)若
,求证:
恒成立;
(2)当
时,求
零点的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c07d25c35ce88f83962403fd7dc797.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d212226826bb1d283046f73311a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次
名校
解题方法
7 . 已知椭圆
过点
,且离心率为
.
(1)求椭圆C的方程;
(2)若动直线l与椭圆C交于A、B两点,O为坐标原点,且
的面积为
,试问
是否为定值?若为定值,求出这个定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6301e2588ebb44105a6d978c9e0b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
(1)求椭圆C的方程;
(2)若动直线l与椭圆C交于A、B两点,O为坐标原点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a0d9a2f14f7e789892487d6585804a.png)
您最近一年使用:0次
名校
解题方法
8 . 已知椭圆
:
过点
,离心率为
,
分别为椭圆C的左右顶点.
(1)求椭圆
的标准方程;
(2)直线
与椭圆
交于
两点,满足
,求证:直线
过定点,并求出定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3b9c17a6c72536ab24b1506cf61a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线
![](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/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37ebd99b8c89e3aa6a239be633cd4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
解题方法
9 . 如图,在长方体
中,
,点E为棱BC上靠近点C的三等分点,点F是长方形
内一动点(含边界),且直线
,EF与平面
所成角的大小相等,则下列说法错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/7e817a3b-039d-4b50-9beb-17f4f79d987f.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1baa492b87c78b80b9a58e24e67fc50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc725182c2fd1413319fea35b95c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/7e817a3b-039d-4b50-9beb-17f4f79d987f.png?resizew=175)
A.![]() ![]() | B.三棱锥![]() |
C.存在点F,使得![]() | D.线段![]() ![]() |
您最近一年使用:0次
2022-11-05更新
|
853次组卷
|
3卷引用:安徽省亳州市2020-2021学年高一上学期期末数学试题
名校
解题方法
10 . 如图,已知圆
的直径
长为4,点
是圆弧上一点,
,点
是劣弧
上的动点,
点是另一半圆弧的中点,沿直径
,将圆面折成直二面角,连接
.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892240271745024/2910421359943680/STEM/ee046130-97aa-499e-935e-3142c07746e4.png?resizew=349)
(1)若
面
时,求
的长;
(2)当三棱锥
体积最大时,求二面角
正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfb836792b1eebfbd08a6f46fae580e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16f6efa10501511dd7c63c5051376c7.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892240271745024/2910421359943680/STEM/ee046130-97aa-499e-935e-3142c07746e4.png?resizew=349)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8099c774a6ae6dd98712b0b90b60cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b2a4541d85e8710408c45c99950b6af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0297943fae12e34fab38c541002b15.png)
您最近一年使用:0次
2022-02-06更新
|
1008次组卷
|
6卷引用:安徽省亳州市第一中学2021-2022学年高二上学期元月月考数学试题
安徽省亳州市第一中学2021-2022学年高二上学期元月月考数学试题安徽省淮北市2022届高三上学期一模理科数学试题安徽省合肥市第一中学2021-2022学年高二下学期3月测试数学试题(已下线)山东省日照市2023届高三一模考试数学试题变式题17-22河北省唐山市开滦第二中学2023届高三考前保温数学试题(已下线)第三章 折叠、旋转与展开 专题一 平面图形的翻折、旋转 微点8 平面图形的翻折、旋转综合训练