解题方法
1 . 如图,在矩形
中,
,
,
为
的中点,将
沿
折起,使得二面角
为
,则
与平面
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18a490a22cac27417ddc794f00a1941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/a18d451b-b3b1-4653-b2ed-aff9b2002be2.png?resizew=454)
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解题方法
2 . 已知四棱锥
的底面是边长为2的正方形,
侧面
,
,
是线段
上的点(不含端点),若侧面
,直线
,侧面
与平面
所成角分别为
,
,
,则下列结论成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb64061e933aea7669294640c331bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c157ff302a881c17514534903c575f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 已知椭圆E:
(
)的离心率为
,且短轴的一个端点B与两焦点A,C组成的三角形面积为
.
(Ⅰ)求椭圆E的方程;
(Ⅱ)若点P为椭圆E上的一点,过点P作椭圆E的切线交圆O:
于不同的两点M,N(其中M在N的右侧),求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(Ⅰ)求椭圆E的方程;
(Ⅱ)若点P为椭圆E上的一点,过点P作椭圆E的切线交圆O:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4be819fc47b2aa19ab2022b3dfeb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2de15162b13ba943f8da2498580cf9.png)
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解题方法
4 . 已知正三棱柱
的侧面积为12,当其外接球的表面积取最小值时,异面直线
与
所成角的余弦值等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
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2020-03-11更新
|
1323次组卷
|
7卷引用:浙江省衢州市常山县天马中学2020届高三上学期入学调研理科数学试题
浙江省衢州市常山县天马中学2020届高三上学期入学调研理科数学试题2020届江西省名师联盟高三入学调研考试数学(理)试题2020届广西柳州高级中学高三2月线上月考数学(理)试题南昌市2020届高三数学(理科)零模试题(已下线)专题25 盘点立体几何中最值问题——备战2022年高考数学二轮复习常考点专题突破(已下线)专题06 立体几何(文)第二篇-备战2020高考数学黄金30题系列之压轴题(新课标版)(已下线)专题06 立体几何(理)第二篇-备战2020高考数学黄金30题系列之压轴题(新课标版)
名校
5 . 已知正项数列
满足:
,
.
(Ⅰ)求
;
(Ⅱ)证明:
;
(Ⅲ)设
为数列
的前n项和,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115689c9094183d953dea6ce66dd60a3.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9fb5ddaa3a93bd350080c761dc2a919.png)
(Ⅲ)设
![](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/70d38414d0f3cc10a748d32cfd0bd6b6.png)
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2020-09-20更新
|
705次组卷
|
3卷引用:浙江省衢州市2017-2018学年高二下学期期末数学试题
6 . 已知函数
,若存在非零实数
,使得
成立,则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0be5afa2a9e64ec663846e1b4c1404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344c62b469b3d98f80d6ad4069790ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f164e2348de7d9967b1832004db124.png)
A.![]() | B.![]() | C.16 | D.4 |
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2020-09-12更新
|
986次组卷
|
5卷引用:浙江省衢州二中2018届高三下学期第二次模拟考试数学试题
浙江省衢州二中2018届高三下学期第二次模拟考试数学试题(已下线)考点11 二次函数与幂函数(考点专练)-备战2021年新高考数学一轮复习考点微专题(已下线)1.5 平面上的距离(1)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)(已下线)2.3 直线的交点坐标与距离公式-2021-2022学年高二数学同步速效提升练(人教A版2019选择性必修第一册)【学科网名师堂】(已下线)专题07 直线和圆的方程的压轴题(一)-【尖子生专用】2021-2022学年高二数学考点培优训练(人教A版2019选择性必修第一册)
名校
7 . 已知函数
(
且
),
(1)若
,且函数
的值域为
,求
的解析式;
(2)在(1)的条件下,当
时,
时单调函数,求实数
的取值范围;
(3)当
,
时,若对于任意
,不等式
恒成立,求实数
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2cdec921a1510c92b40b3a6fc2274da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dab6675e9c318ecdaf5e1da96424cd5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3471484b64504fc545398f52be830010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c0c037867665979b6dc75fb995f9ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24aa16b780156e18f12baa2b8ee0f9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7863b54185da5a3f1a765e1aa0577e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9d8417be87997804ee32a8b44096b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97ab84192e12bb292bc9fbd0b29fbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04495a240f86591602c4e3448c73e0e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2020-01-19更新
|
261次组卷
|
2卷引用:浙江省衢州五校联盟2019-2020学年高一上学期期末联考数学试题
名校
解题方法
8 . 已知函数
,其中
,
.
(1)当
时,求函数
的单调区间;
(2)当
且
时.
①若
有两个极值点
,
(
),求证:
;
②若对任意的
,都有
成立,求正实数t的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1027fc43aadcafee9d0cbda7bf656361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce4430b8b9b0c78de693513a7f88915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a915c1a8a9304aeb307d130faaeb15.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede4ee5ce3f0abfbce7b930f23d62ffb.png)
②若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c608d90deedf83441490d0190e70f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d036d96e005692dc27fc942a1504be.png)
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9 . 已知平面向量
,
,
满足
,
,则对任意的
,
的最小值记为M,则M的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd339584d90f4a39b6d1b6c874bb6cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac1cebd541f7aa05571d06d4a43f89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51159984b2cb00f30b3986315019623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d2cc8eb70240b47f809ab129198815.png)
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2020-04-23更新
|
877次组卷
|
2卷引用:2019届浙江省衢州二中高三下学期第一次模拟考试数学试题
10 . 数列
中,
,
(
).
(1)求数列
的通项公式;
(2)设数列
的前n项和为
,且
(
),求使
取最小值时n的值.
![](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/b9254f7e12643b96d23e28385652c4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b887201fa8ae7c443a049051135efffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9a0d7150fb24be3e28ef7f0e18be93.png)
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