名校
解题方法
1 . 已知向量
与
的夹角
,且
,
.
(1)求
,
;
(2)求向量
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd15ead753cf2927f51d07c7727c6cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29276b43a2950ed71f0f9629a35dfa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404067afb19bd74f447a6c0c832af1da.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af88a7628c71d642d3a6df067c15f5.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
您最近一年使用:0次
解题方法
2 . 已知
,
,
与
的夹角为θ,且
,则θ=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f95c297b230eea1d0e69f769b9ebbb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34fa8ea29001bb1f0c1e5157aff2fca5.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/d148e569bbf9e9e3bd83e236f46f5fd4.png)
您最近一年使用:0次
2023-04-23更新
|
492次组卷
|
4卷引用:吉林省白城市通榆县毓才高级中学有限责任公司2022-2023学年高一下学期期中数学试题
名校
解题方法
3 . 在
中,角A,B,C的对边分别为a,b,c,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948ac82298922e8531c22da6500896a4.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27792cff6517ea5451be47eb20c20d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948ac82298922e8531c22da6500896a4.png)
您最近一年使用:0次
2022-12-12更新
|
523次组卷
|
5卷引用:吉林省长春市东北师范大学附属中学净月实验学校2023-2024学年高一上学期期中质量监测数学试题
名校
4 . 如图,在梯形中,
为
的中点,
,
,
,
.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84651cfbf6a25234265baa7ef676ea.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
您最近一年使用:0次
2023-05-31更新
|
380次组卷
|
6卷引用:吉林省长春博硕学校2022-2023学年高一下学期期中考试数学试题
名校
5 . 已知等边
的边长为2,
为边
的中点,点
是
边上的动点,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170004cbd9c95d39fc720913919d1325.png)
您最近一年使用:0次
2022-05-11更新
|
622次组卷
|
5卷引用:吉林省长春市东北师范大学附属中学2022-2023学年高一下学期期中数学试题