已知向量
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
______ ;若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3effb8e124f2aff06abd49e2cdcf426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7901fc86cb98cdb030d6ee72816dc14a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
更新时间:2024-06-14 19:10:42
|
相似题推荐
填空题-双空题
|
适中
(0.65)
解题方法
【推荐1】在菱形
中,
,且
,若
,则
的值为_________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81f9d1b81e9afad9743c93d9b9d346b.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e0c39518165f6e7f6e0200c0353bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbdb9e966612613860f73b9634dca67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e073708e01a31d6ea0d3826b2bbf6af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff141a77e796894f84d0104f8f947e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81f9d1b81e9afad9743c93d9b9d346b.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】向量
满足
,则
在
方向上的投影为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6223eb06d29ffaca11dd0c96ab3b84b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐3】如图,在
中,已知
,
,
,
,
边上的两条中线
,
相交于点
,则
的余弦值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b010f6888f9900ff159e99e08dc56e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494529576e5b2b25074fcc7986c52a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768182ff1fe010ffc47b5704915d0fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028012ef88546694cd67ac0d44bf6725.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/e9f4ddc3-40fd-4b7f-8d4d-e53562b024a7.png?resizew=223)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】已知向量
,
,其中|
|=
,|
|=2,且(
-
)⊥
,则向量
和
的夹角是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc56f59971bd6f2fae7e76a91174d4a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc56f59971bd6f2fae7e76a91174d4a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc56f59971bd6f2fae7e76a91174d4a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc56f59971bd6f2fae7e76a91174d4a8.png)
您最近一年使用:0次