名校
1 . 规定
,其中
,
是正整数,且
,这是组合数
(
、
是正整数,且
)的一种推广.
(1)求
的值;
(2)设
,当
为何值时,
取得最小值?
(3)组合数的两个性质:①
.②
.是否都能推广到
(
,
是正整数)的情形?若能推广,则写出推广的形式并给出证明;若不能,则说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2f08bfb00be37dae9eb799aab26b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaebe68f17d4855303e74627d862ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbe3301b2d166e953f3ff0ea49f6db0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870c36161f465fc992534b5fc3777f3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6cc052940efc8fee62f77a74829068.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cac9c5c5e4178ffb869aa31bc2f8a9.png)
(3)组合数的两个性质:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d511c15be34d50e73168f6eb57308f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641f34f1399a09c34d64d859592a30d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c008899cf67277542019c0ddca0dcc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 已知椭圆
的左、右两个焦点分别为
,P是椭圆上位于第一象限内的点,
轴,垂足为Q,
,
,
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c7ba090f-4692-4121-bb5f-894dd2b48f54.png?resizew=196)
(1)求椭圆F的方程:
(2)若M是椭圆上的动点,求
的最大值,并求出
取得最大值时M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebee672f609438c59efd324764b8843e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38928a92bc4b44ed3c9b89769f5372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4428ec56246b35cb87bfe7ed50f0ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d77e813e1b90358ba06ba2a603706e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c7ba090f-4692-4121-bb5f-894dd2b48f54.png?resizew=196)
(1)求椭圆F的方程:
(2)若M是椭圆上的动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f077fb4f73c2123538e19365d84748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f077fb4f73c2123538e19365d84748.png)
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2019-12-12更新
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3卷引用:上海市新中高级中学2017-2018学年高二下学期期中数学试题
名校
3 . 已知
,
,
,且
,
是钝角,若
的最小值为
,则
的最小值是_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881e7b6e25cc9b55004a7419adf234cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf48c01fcf117e94fe71d56e5dd1408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2613017de2e76bf8dd10295de827ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0dba9cb0313cb134b015c054dd0777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d44e0603df1928f1b54a342e1dd3f7.png)
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4 . 若动点
在曲线
上变化则
的最大值为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42179166d21d549d0a67fc18eb23ddcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff677cbfcbd171ed58307c42570d252.png)
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2卷引用:上海市第四中学2018-2019学年高二上学期期中数学试题
名校
5 . 设实数
满足
,若
的最大值为12,则
的取值范围是___________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9373e63ea84930266fb39483cc6eb480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a745f728605012e4b580f94ab490966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
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6 . 已知向量
,
的夹角是
,
,
.又有向量
,向量
,其中
.
(1)求
(用含有
,
的表达式)
(2)若
在
处取得最小值,当
,求角
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911c0a2ab5e2e85f1ad267f41cb96b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794efd8cf0cc386faa170d01f357b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1181366d40666079a73496076c382f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07293a24cf2d403f59aa43aaacb8e236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5dd33175846c7e799e99fd0ad30ecf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8912e7470e2a55862a13ec95c4e018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23865ee52040331dee23621b4a15c244.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df12c60531c3f1ad7b4f182f3fe4b96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df12c60531c3f1ad7b4f182f3fe4b96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82120861c1c4f7cc1a7a3f169f082a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f19f7927e2734c146aeffd81e53e5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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7 . 已知向量
,单位向量
与向量
的夹角为
.
(1)求向量
;
(2)若向量
与坐标轴不平行,且与向量
垂直,令
.请将
表示为
的函数
,并求函数
的定义域和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a234421f2ea6e6b07f20d5aede234c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184c6736108865aa9ba3680f3d50526a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9856ad2a8dd1b673ec2cfa9ee0a1eaff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184c6736108865aa9ba3680f3d50526a.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184c6736108865aa9ba3680f3d50526a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543a1701b0b6ab23d9a8690453717132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f33f28247234029ae7589666c3f57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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8 . 如图,直线
与抛物线
交于
两点,线段
的垂直平分线与直线
交于
点,当
为抛物线上位于线段
下方(含
)的动点时,则
面积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d585d2d6643471640905d234d9538c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4426e9aac21e8b4bfc2b5ced1325ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3582caa8f1ea0b0be9006f819e050cff.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45b8b000c9c286bff8a480dbf03b513.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/e9966264-a170-415a-b315-bd9672c2a732.png?resizew=199)
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2010·河北邯郸·二模
名校
解题方法
9 . 已知向量
为单位向量,且
,向量
与
共线,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17905fd548fd71ded74fd47fb17375e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4316a85ebef3e4387f74ccc6c6fc56.png)
A.1 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-11-04更新
|
1985次组卷
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11卷引用:上海市徐汇区上海中学2020-2021学年高二上学期期中数学试题
上海市徐汇区上海中学2020-2021学年高二上学期期中数学试题上海市南洋模范中学2020-2021学年高一下学期期中数学试题安徽省安庆市怀宁中学2020-2021学年高二(实验班)上学期第二次质量检测理科数学试题(已下线)第14讲 向量单元复习(讲义)-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)江苏省无锡市辅仁高级中学2021-2022学年高一下学期期中数学试题(已下线)2010年河北省邯郸市高三第二次数学文科试题福建福州格致中学2019—2020学年高一上学期期末数学试题(已下线)第二章 平面向量(能力提升)-2020-2021学年高一数学单元测试定心卷(北师大2019版必修第二册)北京一零一中学2022届高三9月开学练习数学试题(已下线)第28讲 平面向量范围与最值问题-2022年新高考数学二轮专题突破精练(已下线)第06讲 拓展一:平面向量的拓展应用 (讲)
10 . 如图,正方形
、
的边长都是1,而且平面
、
互相垂直.点M在
上移动,点N在
上移动,若
.
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105823913230336/3105917612531712/STEM/926b8aed5d384784a3a51442412de335.png?resizew=165)
(1)求
的长;
(2)a为何值时,
的长最小;
(3)当
的长最小时,求面
与面
所成二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c57b05fe8f42db9a074224b2a02f78.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105823913230336/3105917612531712/STEM/926b8aed5d384784a3a51442412de335.png?resizew=165)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)a为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cb18c10820d927ecd53326f58aaf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee5a94f9063a71581f409e47ebaf602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2022-11-09更新
|
728次组卷
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6卷引用:上海市实验学校2021-2022学年高二上学期期中数学试题