解题方法
1 . 已知
,
,且
与
夹角为120°.求:
(1)
;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632ed40b1486d32a1ab5f8b8eaf961e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf508c8d34aab12dae46e1d05fcd7f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a5bb6ffe2d131d22fa9932f7ea91c2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1768d1918c2e68b5df05d2dfc39633a.png)
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2 . 已知单位向量
的夹角为
,向量
,则
的夹角等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111939547e581e8bf029a241b9e9cb05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c8ffd6d79c6690fdd5f5723da624fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
3 . 已知
的夹角为
.
(1)求
;
(2)求
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d194ecefc9101001d88d3cc0bc9d6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e2d00aa2ba7cd89321974a0851d3ef.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f19271ff3a4218bfab2b5578ee917a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c23f690b5cc8c07c53f81f7d0de9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
您最近一年使用:0次
2022-05-01更新
|
327次组卷
|
2卷引用:广西龙胜各族自治县龙胜中学2021-2022学年高一下学期期中考试数学试题
解题方法
4 . 已知平面向量
,
满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ce4ddb327aa782f629f7c6226a69fc.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2d69f3beabd8d431b18cb9269ad949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c7d73ed9c786e3053fec2467b35b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ce4ddb327aa782f629f7c6226a69fc.png)
您最近一年使用:0次
名校
5 . 已知单位向量
,
,的夹角为
,向量
,向量
.
(1)若
,求
的值;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf9289a7e68905cea8ec70ce313dd82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fab1a8e4f1154ef109f11513b78364c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069da5c624837df29947b7b8bf722097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdd77301bc7551f074cb148830fc171.png)
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2020-08-03更新
|
877次组卷
|
6卷引用:广西桂林市逸仙中学2021-2022学年高一下学期期中考试数学试题
广西桂林市逸仙中学2021-2022学年高一下学期期中考试数学试题辽宁省辽阳市2019-2020学年高一(下)期末数学试题陕西省商洛市2019-2020学年高一下学期期末数学试题(已下线)练习17+平面向量综合练习-2020-2021学年【补习教材·寒假作业】高一数学(苏教版)江苏省宿迁市第一中学2022-2023学年高一下学期3月阶段模拟数学试题江苏省镇江市扬中市第二高级中学2022-2023学年高一下学期期中数学试题
10-11高二下·辽宁大连·期末
名校
6 . 已知向量
,
的夹角为
,且
,
,若
,
,
求(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e708be069ecbfa5b18d36b40d0b8ccec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc0de16bdd7237d6e171e35b4366f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1e29a15e9156d0180f12324166e4f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8def4ffdddebb6254490eb3303a2e76.png)
求(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a560b8ff794c12dc8d194bcd2e3f3554.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35dae14065a7658309bc830ba6d21a0.png)
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2016-11-30更新
|
815次组卷
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4卷引用:广西桂林市普通高中联盟2021-2022学年高一下学期期中数学试题
广西桂林市普通高中联盟2021-2022学年高一下学期期中数学试题广西桂林市2018-2019学年高一下学期期末数学试题(已下线)2010-2011年辽宁省瓦房店市高级中学高二下学期期末联考理科数学湖南省衡阳市第二十六中学2019-2020学年高一下学期期末数学试题