名校
1 . 富比尼原理又称算两次原理,是组合数学中非常重要的计算方法,下面的组合恒等式可以用富比尼原理进行证明,具体如下:
人中有1人是军人,从
人中选
人各奖励1颗星,共有
种选法,另一方面,这等价于考虑这
人中的军人是否被选中,若选中军人,则有
种选法,若未选中军人,则有
种选法,所以
;
(1)若
,求关于
的方程
的解;
(2)将题干中的问题推广到
人中有
人是军人的情形,写出结论并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c95df1e638ebfe52ab35c93d4e424c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7707aba7b9fed2c8e4704b82ce09087a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dac9ce7c08de49a30f1d982bbedee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e4655d43814eae5e21ca44840d918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4746217439e9cbcfe130bc074736e86b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b54fdc920fd0a627959bbc5bd292d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875978e3eeb54751d2ce83ae18421657.png)
(2)将题干中的问题推广到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b367cda0011d8968cb46206aa0bb4aa.png)
您最近一年使用:0次
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2 . 狂欢节期间,动漫社制作了各不相同的原神海报和方舟海报各5张组成一套,凡买一杯奶茶可以选择从这一套海报中随机抽取4张,某原神粉丝参加抽奖,他从一套海报中抽到原神海报不少于两张的概率为__________ .
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解题方法
3 . 设函数
,其中a为常数.对于给定的一组有序实数
,若对任意
、
,都有
,则称
为
的“和谐数组”.
(1)若
,判断数组
是否为
的“和谐数组”,并说明理由;
(2)若
,求函数
的极值点;
(3)证明:若
为
的“和谐数组”,则对任意
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8beb896a3c01154585e0ec979934f602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911f2e62e650373b98e1b76fb8a8b24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33890c6b0bf167514d44139d9dca0154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774ac39e474f9c5f4e17a4c0416413cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911f2e62e650373b98e1b76fb8a8b24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6a9ffffc0c461881b427c543924cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e7c12bff76b3a3151dc3e392c60d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911f2e62e650373b98e1b76fb8a8b24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af0614daffb549e1adc7c24a5bbdf42.png)
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2023-05-11更新
|
733次组卷
|
5卷引用:上海市七宝中学2023届高三下学期4月月考数学试题
上海市七宝中学2023届高三下学期4月月考数学试题上海市南洋中学2023届高三三模数学试题上海市金山中学2022-2023学年高二下学期期末数学试题上海市静安区风华中学2024届高三上学期10月月考数学试题(已下线)上海市高二数学下学期期末模拟试卷02--高二期末考点大串讲(沪教版2020选修)
名校
4 . 已知
的三个内角分别为A,B,C,则下列判断正确的是( )
命题p:对任何锐角A,都存在
,使得
;
命题q:对任何锐角A,都存在
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
命题p:对任何锐角A,都存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18dbd4b3e3123e480788b3921a8e1bd1.png)
命题q:对任何锐角A,都存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3daa8291bbff3605c2b42d8234ad155.png)
A.p是真命题,q是真命题 | B.p是真命题,q是假命题 |
C.p是假命题,q是真命题 | D.p是假命题,q是假命题 |
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5 . 一般的数学建模包含如下活动过程:①建立模型;②实际情境;③提出问题;④求解模型;⑤实际结果;⑥检验结果,请写出正确的序号顺序________ .
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2023-05-11更新
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463次组卷
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2卷引用:上海市七宝中学2023届高三下学期4月月考数学试题
名校
解题方法
6 . 已知曲线
,点
,
是曲线
上任意两个不同点,若
,则称
,
两点心有灵犀,若
,
始终心有灵犀,则
的最小值
的正切值![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b773ce76a64bf854edf0fd972a28049e.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762a9015473e9ec9b21eccc15224ff72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04992fc293d05964e8b6b373549cd013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4438bae1705c0f26beddf41322c087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b773ce76a64bf854edf0fd972a28049e.png)
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2023-04-17更新
|
994次组卷
|
6卷引用:上海市闵行(文绮)中学2023-2024学年高三下学期3月月考数学试卷
名校
7 . 如果曲线
存在相互垂直的两条切线,称函数
是“正交函数”.已知
,设曲线
在点
处的切线为
.
(1)当
时,求实数
的值;
(2)当
,
时,是否存在直线
满足
,且
与曲线
相切?请说明理由;
(3)当
时,如果函数
是“正交函数”,求满足要求的实数
的集合
;若对任意
,曲线
都不存在与
垂直的切线
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749c140afe3f0d42e3cad85909d63938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06dfc9e95cade14ae9b7fc89519a2dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedde86fd5b5e93c14ffd9190fc7d7a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cfc27d13b4d07ade4729b481cc95735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/534180efa9c8ffc5ac7cf7f2f035d11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4526d19896bdff6cb66b4aea9a6ef24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24600bfcfb91c661eb9d237956e011ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
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2023-04-14更新
|
977次组卷
|
5卷引用:上海市闵行区2023届高三二模数学试题
上海市闵行区2023届高三二模数学试题(已下线)专题03 导数及其应用(已下线)专题02 函数及其应用(已下线)专题08 平面解析几何-学易金卷湖北省襄阳市第五中学2023届高三下学期适应性考试(一)数学试题
解题方法
8 . 已知O为坐标原点,曲线
:
和曲线
:
有公共点,直线
:
与曲线
的左支相交于A、B两点,线段AB的中点为M.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/5ecf3303-6c6f-4e2d-8ce1-76905e372912.png?resizew=162)
(1)若曲线
和
有且仅有两个公共点,求曲线
的离心率和渐近线方程;
(2)若直线OM经过曲线
上的点
,且
为正整数,求a的值;
(3)若直线
:
与曲线
相交于C、D两点,且直线OM经过线段CD中点N,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8074822f47553df118dd3c1897d0843e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b861ba40387cb2bcd04945f5a371a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b3c8be9aee074c9a3203abace248ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/5ecf3303-6c6f-4e2d-8ce1-76905e372912.png?resizew=162)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)若直线OM经过曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f241e6fc5ea93befbc875e680fafde07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f06443b381a16ea4a5e39e19794a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b355f270b2d905116085c6984c59f12.png)
您最近一年使用:0次
9 . 若数列
、
均为严格增数列,且对任意正整数n,都存在正整数m,使得
,则称数列
为数列
的“M数列”.已知数列
的前n项和为
,则下列选项中为假命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102db69b759f7bea82298ac24dee642b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.存在等差数列![]() ![]() ![]() |
B.存在等比数列![]() ![]() ![]() |
C.存在等差数列![]() ![]() ![]() |
D.存在等比数列![]() ![]() ![]() |
您最近一年使用:0次
2023-04-14更新
|
1377次组卷
|
8卷引用:上海市闵行区2023届高三二模数学试题
上海市闵行区2023届高三二模数学试题(已下线)专题06 数列及其应用上海市建平中学2022-2023学年高一下学期期末数学试题(已下线)专题17 数列探索型、存在型问题的解法 微点3 数列探索型、存在型问题综合训练上海市华东政法大学附属松江高级中学2023-2024学年高二上学期期中考试数学试卷(已下线)专题06 数列在高考中的考法(难点,十一大题型+过关检测专训)-2023-2024学年高二数学《重难点题型·高分突破》(人教A版2019选择性必修第二册)(已下线)第4章 数列(压轴题专练)-2023-2024学年高二数学单元速记·巧练(沪教版2020选择性必修第一册)上海市川沙中学2023-2024学年高一下学期数学5月月考数学试卷
解题方法
10 . 平面上有一组互不相等的单位向量
,
,…,
,若存在单位向量
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213274c18599bc12d38d9db731f5790c.png)
,则称
是向量组
,
,…,
的平衡向量.已知
,向量
是向量组
,
,
的平衡向量,当
取得最大值时,
值为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76916c6ff302cf4fb4b6ace5bb3a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337d0dc1076cfdb02ffb40bf4dac0d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213274c18599bc12d38d9db731f5790c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81e84d94bf8392d4dddfd1c4ec283af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76916c6ff302cf4fb4b6ace5bb3a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337d0dc1076cfdb02ffb40bf4dac0d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694fe9d0e953ef1a6524ff80e7a0fba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27699fcd8645757a34bd295b426052be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de38820e63e0564899185f1bddbf3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db92d66fa701ce12ae0cd529121f6845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a18a83264cadb091d52945a06b8f684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883798a4b2ce648a28c6e49b83d6f21a.png)
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