1 . 甲烷分子
的四个氢原子位于棱长为1的正四面体的四个顶点,碳原子C位于四面体的中心
,记四个氢原子分别为
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13d906ff99fdc08d57f4de3785580c0.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33fbdd535c70284a4e988fff972e4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e6fecc49564bf3341dc355e0ec4d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd27548b6259e9e7dced1a7e22cb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0c83fcca59db51cff4e3995c45081e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54253784d559487fe67009c9223cb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9f017376a9c9c31829722d27857012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13d906ff99fdc08d57f4de3785580c0.png)
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2 . 如图,点M、N分别在△ABC的边AB、AC上,且
,
,D为线段BC的中点,G为线段MN与AD的交点.若
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637ead8ff2c33546dc4b7ae439d3cffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e73df9bd672a72bd945449a606cbd27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3235f0f3c3faa679c2e9420d298a1f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2be5e24170427caed4175e2863995aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/66865588-9b96-4f15-8040-cab6d1f93f20.png?resizew=176)
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3 . 已知平面向量
,
,
满足
,且
,则
最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e275e2f458db459e28f43062ab8d2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9885da9bc997ce0763edcb000b85a686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0055cbdfb047c8bd2791fefd81eb0d0d.png)
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名校
解题方法
4 . 已知点
是边长为1的正方形
所在平面上一点,满足
,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6424ab53981baf4a7abd18418db5d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb3c612891aac6c99382002876abca1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-11-27更新
|
1531次组卷
|
6卷引用:河北省武安市第三中学2021届高三上学期期中数学试题
河北省武安市第三中学2021届高三上学期期中数学试题湖南省湖湘名校教育联合体2021届高三入学考试数学试题(已下线)专题04 平面向量-【备战高考】2021年高三数学高考复习刷题宝典(单项选择专练)江西省红色七校(分宜中学、会昌中学等)2021届高三第二次联考数学(文)试题(已下线)上海市华东师范大学第二附属中学2022届高三上学期9月月考数学试题(已下线)第11讲 平面向量-2
名校
解题方法
5 . 在
中,
,
,
,O为
所在平面内一点,并且满足
,记
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7d9f95385876b8ea36f53bd0b1d51d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966e7702df020edd428a0ac18ae544b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2b9791632582c3acc051121f45bab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d16552d5603f296554a9690d55c2d11.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-07-04更新
|
1059次组卷
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4卷引用:浙江省绍兴市柯桥区2020届高三下学期6月高考适应性考试数学试题
6 . 已知点P(-2,5)在圆
上,直线l:
与圆C相交于A、B两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a890ec2a950f422f1be36621670a36.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a97f6fd0acd326bf0860804a4393d592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084b7e3980ce2aba02c620e9655f84d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a890ec2a950f422f1be36621670a36.png)
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2020-05-11更新
|
276次组卷
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2卷引用:2019年全国高中数学联赛广西壮族自治区预赛
7 . 已知P是
内部一点
,记
、
、
的面积分别为
、
、
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4905b0115a1a4efa8470316a40a7d02.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d254816f7dea0b61c7b032e0ea4847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4905b0115a1a4efa8470316a40a7d02.png)
您最近一年使用:0次
2019-12-11更新
|
690次组卷
|
2卷引用:上海市七宝中学2019-2020学年高二上学期期中数学试题
名校
8 . 在平面上,
,
,
,若
,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7eb6925e75de0b7b7cb45d5f8da98b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e29c718b27c6427c957fa82b1ee89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1032f8e849a4933a4426afc57b4dcd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0662e509823e1cee4598caec4c677a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10769b19729996c947add3ac158ca0e5.png)
您最近一年使用:0次
2019-12-11更新
|
753次组卷
|
3卷引用:上海市七宝中学2019-2020学年高二上学期期中数学试题
名校
9 . 已知△ABC三顶点的坐标为A(1,0),B(0,2),O(0,0),P(x,y)是坐标平面内一点,且满足
,
0,则
的最小值是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7f3558bfae83e311164422fc6d6ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842a97e87fa5ceae1b8d94641395fc78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645871f0e470c3ebf9b0ada69eef606f.png)
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2020-03-17更新
|
132次组卷
|
3卷引用:广西河池市高级中学2018-2019学年高二上学期第一次月考(开学考试)数学试题
广西河池市高级中学2018-2019学年高二上学期第一次月考(开学考试)数学试题(已下线)6.3.5 平面向量数量积的坐标表示(分层练习)-2020-2021学年高一数学新教材配套练习(人教A版2019必修第二册)2023版 湘教版(2019) 必修第二册 过关斩将 第1章 1.5 向量的数量积 1.5.2 数量积的坐标表示及其计算
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10 . 已知两个非零向量
不共线,
.
(1)证明:
三点共线;
(2)试确定实数
,使
与
共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d184ae171c511d3ab7eebb7dbb4eae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f773b5ebfaf2c5c6624a323f7e4a99.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1378530dfec264f4bf99a179826dc957.png)
(2)试确定实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea1f268299d57e5362182760a5961af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f200069e313c5863a4efab246fd347a.png)
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2019-10-09更新
|
949次组卷
|
3卷引用:人教A版 必杀技 第二章 平面向量 第2.2节综合训练