1 . 如图所示,平面内有三个向量
,
,
,
与
的夹角为120°,
与
的夹角为150°,且
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8337706c550bc095d7a2bd872221a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8337706c550bc095d7a2bd872221a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5acc68e88a56f6c1b01fc6ca2d428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c21f133b919d567cf96cf64cef210b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54247ad0b7bcc3ea751069ae9c8584b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/7d032e20-c717-4c25-b4e7-4696c9767eba.png?resizew=142)
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2 . 若等边三角形
的边长为1,点
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32462f685492db1cd21e30b8f21578b3.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdae2f4db4d45acd0ade29001745e69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32462f685492db1cd21e30b8f21578b3.png)
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解题方法
3 . 设
为△
的重心,过点
作直线分别交
,
于点
,
,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ef4a3da53511ce0ef1b55b28b990b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1870585b371e6d07c7803635daaef685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012dc996c0168690f89bd7166fc3a887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ef4a3da53511ce0ef1b55b28b990b.png)
您最近一年使用:0次
2020-06-26更新
|
395次组卷
|
3卷引用:湖南省永州市第四中学2021-2022学年高一下学期第一次月考数学试题
名校
解题方法
4 . 在平面直角坐标系中,四边形ABCD是平行四边形,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2714c95b28ade4d8b52885c5a893b59.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2d0cedd559c80b64815a207bb93cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b20184e3d3585a734928542e18509fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2714c95b28ade4d8b52885c5a893b59.png)
您最近一年使用:0次
2020-03-28更新
|
195次组卷
|
4卷引用:2020届湖南省永州市祁阳县高三上学期第二次模拟数学(文)试题