如图,已知向量
,
不共线,求作向量
.
![](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/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-12-03 20:22:38
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【推荐1】已知向量
,O为坐标原点.
(1)若
,求实数k的值;
(2)在(1)的条件下,求向量
与
的夹角余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d611aeb31caa4d2f553598278d40418.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b030ff1967682591d1408f06ca71bd.png)
(2)在(1)的条件下,求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e88bca29b1406f27f1913b7f25fb483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
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【推荐2】已知六边形ABCDEF为正六边形,且
,分别用
,
表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b153cac1ba1bf85a271ba1e7cef1fb37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de112144517e06d370c9c86b9dd0d47d.png)
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