如图,已知两个单位向量
和向量
,
与
的夹角为
,且
,
与
的夹角为
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc2294ee512fa1ee5f14ad65a24a499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191eaca5921652db6d3f8f3e9c8842ab.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/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56788a749cd30a1ba6fe6aea4410b523.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/20b69099d2b74ffbb1f365e1468bd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe792bb8d6b78a34fb2b48d7af321bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113986d9507fc5015e71989831c128b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/d5bb0fc5-4c4f-4a71-97dc-fd4e951c906b.png?resizew=141)
A.-1 | B.![]() | C.![]() | D.1 |
更新时间:2023-10-29 11:29:17
|
相似题推荐
单选题
|
适中
(0.65)
解题方法
【推荐1】如图所示,在平面四边形
中,
,
,
.若
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892244015841280/2894435371130880/STEM/10c82386-d454-4fb5-9322-7bbf1668f498.png?resizew=186)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e39bee1445161f91213c83b498b8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fed04168633e517050e4f05602421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e8c354554a9016f81105346cb71755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892244015841280/2894435371130880/STEM/10c82386-d454-4fb5-9322-7bbf1668f498.png?resizew=186)
A.![]() | B.2 | C.3 | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐1】若单位向量
,
的夹角为
,则
与
的夹角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83c5803cc8c05849028a57c4bd4ee72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】下列命题正确的是( )
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.![]() ![]() | D.若![]() ![]() ![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】如图,在菱形ABCD中,
,E为CD的中点,则
的值是( )
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368595844718592/2369759658516480/STEM/7b8735fc1d684315938ed1f0a98bee3b.png?resizew=108)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfd1a880863384975be44c2038c7645.png)
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368595844718592/2369759658516480/STEM/7b8735fc1d684315938ed1f0a98bee3b.png?resizew=108)
A.1 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】如图,在四边形
中,
,
,
,
分别为边
上的动点,且
,则
的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/20175534-1b67-4ab8-b8cd-09eedcad69b4.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319753f29ef93e85d2a0c93d824a0a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739d8b908b3734f9bd71f887c068350c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370c2441fc7db7f57d5de5f426d91978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7173b357dec0dca7d6da123345089741.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/20175534-1b67-4ab8-b8cd-09eedcad69b4.png?resizew=193)
A.![]() | B.![]() |
C.![]() | D.![]() |
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