名校
1 . 如图,在
中,已知
,
,
,
,
边上的两条中线
,
相交于点
,则
的余弦值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b010f6888f9900ff159e99e08dc56e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494529576e5b2b25074fcc7986c52a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768182ff1fe010ffc47b5704915d0fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028012ef88546694cd67ac0d44bf6725.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/e9f4ddc3-40fd-4b7f-8d4d-e53562b024a7.png?resizew=223)
您最近一年使用:0次
2023-08-07更新
|
235次组卷
|
4卷引用:江苏省江阴市华士高级中学2023-2024学年高一下学期3月学情调研数学试题
江苏省江阴市华士高级中学2023-2024学年高一下学期3月学情调研数学试题(已下线)专题04 向量的数量积-【寒假自学课】(苏教版2019)(已下线)第一次月考卷02-《重难点题型·高分突破》(人教A版2019必修第二册)山东省东明县第一中学2022-2023学年高一下学期3月月考理科数学试题
解题方法
2 . 在
中,角A,B,C的对边分别为a,b,c,若
,且G是
的重心,
.则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6758ba6ed730fa1f86fe87557a7bb1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ee0da554e49ecd3b5aa91551a23766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff83f4f0c5202d27c350e393527529a.png)
您最近一年使用:0次
2022-07-02更新
|
520次组卷
|
3卷引用:【江苏专用】专题06解三角形(第二部分)-高一下学期名校期末好题汇编
解题方法
3 . 等边
的边长为
,点
为
的重心,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955890c69d22452082771c2e1a438c7f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955890c69d22452082771c2e1a438c7f.png)
您最近一年使用:0次
4 . 设A,B,C,D为平面内四点,已知
,
,
与
的夹角为
,M为AB的中点,
,则
的最大值为________ ,此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffbac78046b8e75a5dfb2be33eef8fac.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/163563595212395e942d69162e5410ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c3f9b1fff07a7c30d99ca1fb291f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a773c1b2fb1f8058e539b5b41b7675c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f659607fa095e4a9d8b724b7b01324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffbac78046b8e75a5dfb2be33eef8fac.png)
您最近一年使用:0次
名校
5 . 在
中,已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa78bebc49de88d3f08cade5ab93696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4995ec65d0748dfeedc9068e0a5f2c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-03-20更新
|
514次组卷
|
3卷引用:模块一 专题5 《解三角形》(苏教版)
解题方法
6 . 在平面凸四边形
中,已知
,
,
,
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8c8b7f52cb48a21fdcff3e837a123d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517a46d2a7a3ac13a7642db7696c8672.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
7 . 已知正六边形
的中心为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() |
C.存在![]() ![]() | D.![]() |
您最近一年使用:0次
2022-07-02更新
|
473次组卷
|
2卷引用:【江苏专用】专题03平面向量(第一部分)-高一下学期名校期末好题汇编
名校
解题方法
8 . 在等腰直角三角形
中,斜边
,向量
,
满足
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76afa02e86b8700e9cc39fc765d38902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3bfc5861444349c69a9d306c60c044.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-06-28更新
|
464次组卷
|
4卷引用:【江苏专用】专题04平面向量(第二部分)-高一下学期名校期末好题汇编
解题方法
9 . 已知向量
与
的夹角
,且
,
.
(1)求
,
;
(2)求
;
(3)
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905dd10639c9fef5ef8d66a124756140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6316d995f00623f05fc3d56a6cbe5f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db24e47304fec964e8cb9278280046bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03497c8751eac317efaf3bba8e46eda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28319a6c0551febf6103ebef28ed877d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98af3e54554c93c3fe4c2a0aa6edd6.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d533f7c7b37c6a7318b3bdfa0ad06cbd.png)
您最近一年使用:0次
名校
10 . 如图所示,平行四边形ABCD中,
,
,H,M分别是AD,DC的中点,F为BC上一点,且
.
,
为基底表示向量
与
;
(2)若
,
,
与
的夹角为
,求
.
(3)设线段AM、FM的交点为
,在(2)的条件下,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9d8a08fc52c31cc1a7f527d18b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184359fe3cadc363cf4ebe586c2b3db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558098da135bc12e7fdca05d14c3848e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6d728b430549f00bb9c0a7bf8bf7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0d158d2784ff23566dcde9bf3c1af7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a66059d36a4978d91c4aa74f1cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e6495dc47b3139837684e83b6aae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4516c0d5396e577db15fde23ee862f.png)
(3)设线段AM、FM的交点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccf606a352f0946c9593210784f6450.png)
您最近一年使用:0次