名校
1 . 已知向量
与
的夹角
,且
,
.
(1)求
,
;
(2)求
与
的夹角的余弦值.
(3)若
,求
在
上的投影向量.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca81a3bdf849b4c9ebb73854d54b92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964b31705ea5f9a1ea20a8572c5e7ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95bdc1b4534d518eddce7d08d970726.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85037a7822cd9642d0c08ca29d61b259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecce1ed933a1802df36b35805d6a144a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b98386771bbcbdb72732c37633dff29.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c98ddf3126d1e6cbc8f396720399e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
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2021-07-10更新
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5卷引用:天津市芦台一中、静海一中、蓟州一中、杨村一中等七校2020-2021学年高一下学期期中联考数学试题