名校
解题方法
1 . 已知向量
,
.
(1)求
;
(2)求向量
与向量
的夹角
的余弦值;
(3)若
,且
,求向量
与向量
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6569e50f43b3d8645652ecc13b62066e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ac06908cf74962e97ac2f0ad7ef21c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffc403ded5faedb326b83d5d3f69a30.png)
(2)求向量
![](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/c24095e409b025db711f14be783a406c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18e5e9bbe8e84d5ccb38da630f582ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae303fa66cee2c355da2f81a590affdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
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2021-07-31更新
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7卷引用:模块四 专题2 重组综合练(江苏)