1 . 已知E,F,G,H分别是空间四边形ABCD的边AB,BC,CD,DA的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883785260703744/2885873556455424/STEM/1c8f5b2d-aaa7-494e-86b5-cbcfa9ab717e.png?resizew=234)
(1)用向量法证明E,F,G,H四点共面;
(2)设M是EG和FH的交点,求证:对空间任一点O,有
.
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883785260703744/2885873556455424/STEM/1c8f5b2d-aaa7-494e-86b5-cbcfa9ab717e.png?resizew=234)
(1)用向量法证明E,F,G,H四点共面;
(2)设M是EG和FH的交点,求证:对空间任一点O,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1696ba7e9fc3f3b9837032c87f7fc8.png)
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解题方法
2 . 定义空间中既有大小又有方向的量为空间向量.起点为
,终点为
的空间向量记作
,其大小称为
的模,记作
等于
两点间的距离.模为零的向量称为零向量,记作
.空间向量的加法、减法以及数乘运算的定义与性质和平面向量一致,如:对任意空间向量
,均有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bcfdf754e71318fb8329b8e7c09264.png)
,
,
;对任意实数
和空间向量
,均有
;对任意三点
,均有
等.已知体积为
的三棱锥
的底面均为
,在
中,
是
内一点,
.记
.
(1)若
到平面
的距离均为1,求
;
(2)若
是
的重心,且对任意
,均有
.
(i)求
的最大值;
(ii)当
最大时,5个分别由24个实数组成的24元数组
满足对任意
,均有
,且对任意
均有
求证:
不可能对任意
及
均成立.
(参考公式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c082be7f93f355e1ca70588a4a89aead.png)
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fde0a8b4ec1e2fff42cee3fc54c0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fde0a8b4ec1e2fff42cee3fc54c0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49da589810153e2ec39ed656a2b61f4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12de8a4f788ff23d36e74c811354779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bcfdf754e71318fb8329b8e7c09264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3ff5e2f25dfebafaf8db07712ff706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff47a4801df7bc7bce1cb52327a7b174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e0a953946d9e878aa017c7f24ffb40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0714b48d55f6b0854fb90a4255bc49c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa157b4f65f3a9aa1f7f82de02e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1e19465c82977a26ca6900622ee1bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718ba76bf48024ca425948e470e60042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761455094dc4913de76122017a243dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48ac6b0dda0647d7dad3287ce4ad258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d131fd570dc36b912396dc2dd06405c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4aeda1e642ce85f1c0394bc419bda8e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49f84442a1b38f27ac977214cd4b688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902a402a179a09f74f2391fb5cb4ae6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247daad150250fc13a230d5375adda93.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(ii)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab39849dc21c8c68cd5cde0911d5db23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61e6011a0717ef57516821d0407a656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae3155971b2bb3c9d68b43e14b7186f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ffe9f4e3243bd760835af03fa7ffe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c053ebe33366203ad0eca474760118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d05f59bfd6b1f55920e73653bf87a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ffe9f4e3243bd760835af03fa7ffe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db09e9844b90e46a6f2f5a710b6a3451.png)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c082be7f93f355e1ca70588a4a89aead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2343b61be295955a2b9baea86202f32.png)
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2024-06-13更新
|
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2卷引用:福建省厦门第一中学2023-2024学年高一下学期6月适应性练习数学试卷
3 . 如图所示,四面体
中,G,H分别是
的重心,设
,点D,M,N分别为BC,AB,OB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/4d160c3a-249c-4cb4-a5de-8cdf8321b8c7.png?resizew=243)
(1)试用向量
表示向量
;
(2)试用空间向量的方法证明MNGH四点共面.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1262ec403745d82befa99d4c6c2ae35b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8ab14cb4f1a62f730d56f702f6e99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f570823f32dce24caed626e00a0857.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/4d160c3a-249c-4cb4-a5de-8cdf8321b8c7.png?resizew=243)
(1)试用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3865341eda32747025e067ad4cc17ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f54bf88a2dfb8265280b9d07e7ee528.png)
(2)试用空间向量的方法证明MNGH四点共面.
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7卷引用:福建省福州市山海联盟教学协作校2023-2024学年高二上学期期中联考数学试题
福建省福州市山海联盟教学协作校2023-2024学年高二上学期期中联考数学试题河北省沧州市部分学校2022-2023学年高二上学期第一次阶段测试数学试题(已下线)6.1.3 共面向量定理(练习)-2022-2023学年高二数学同步精品课堂(苏教版2019选择性必修第二册)(已下线)6.1.3共面向量定理(1)1.1.1 空间向量及其线性运算练习(已下线)专题01空间向量及其运算(4个知识点8种题型3个易错点)(3)(已下线)6.1 空间向量及其运算(4)
名校
4 . 如图,在正方体
中,E在
上,且
,F在对角线A1C上,且
若
.
![](https://img.xkw.com/dksih/QBM/2021/10/17/2831370265542656/2834741348884480/STEM/43af6c607d2b47779921eddaa0dbcaea.png?resizew=176)
(1)用
表示
.
(2)求证:E,F,B三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a97ed73a913c5fc229701667cdfa1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9f426e9532dee6aac46550ea7c3f559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a719bb991be9311a0527f6c51ef9146a.png)
![](https://img.xkw.com/dksih/QBM/2021/10/17/2831370265542656/2834741348884480/STEM/43af6c607d2b47779921eddaa0dbcaea.png?resizew=176)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/726b74cd341bd768aad047b941437e3c.png)
(2)求证:E,F,B三点共线.
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9卷引用:福建省厦门大学附属科技中学2022-2023学年高二上学期10月月考数学试题
福建省厦门大学附属科技中学2022-2023学年高二上学期10月月考数学试题广东省深圳市厚德书院2021-2022学年高二上学期10月月考数学试题(已下线)6.1.1空间向量的线性运算(备作业)-【上好课】2021-2022学年高二数学同步备课系列(苏教版2019选择性必修第二册)(已下线)专题1.2 空间向量及其线性运算-重难点题型检测沪教版(2020) 选修第一册 同步跟踪练习 第3章 3.1 第2课时 空间向量的数量积运算与共线(已下线)6.1.1 空间向量的线性运算(练习)-2022-2023学年高二数学同步精品课堂(苏教版2019选择性必修第二册)(已下线)专题1.1 空间向量及其线性运算【八大题型】-2023-2024学年高二数学举一反三系列(人教A版2019选择性必修第一册)(已下线)高二上学期第一次月考十八大题型归纳(拔尖篇)(1)(已下线)专题01 空间向量及其运算10种常见考法归类(1)
名校
5 . 如图,在空间四边形SABC中,AC,BS为其对角线,O为
的重心,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/72f2ce98-68e9-435f-a87b-02be9794ddfc.png?resizew=125)
(1)求证:
;
(2)化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/72f2ce98-68e9-435f-a87b-02be9794ddfc.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf0edea792798049cd728af69f74e19.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e908deb6f696e9e5598969b88345326.png)
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福建省尤溪第一中学2021-2022学年上学期高二年段核心素养能力测试数学试题(已下线)专题1.2 空间向量及其线性运算-重难点题型检测沪教版(2020) 选修第一册 同步跟踪练习 第3章 3.1 第1课时 空间向量及其线性运算