名校
1 . 已知
,
,且
与
的夹角为
.
(1)求
.
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e310702748855c3edccd151aae0143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34fa8ea29001bb1f0c1e5157aff2fca5.png)
![](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/732250efe9c8c0cbca127fb2ed2a4bf9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6975f67386189e581befc0fc21faa5.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c75a15198f2465863fd46e0794d0bf2.png)
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2023-04-08更新
|
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名校
解题方法
2 . 设向量
,
的夹角的余弦值为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06bde0c41c89ca5091b7a0843eb22a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d2d267caf23c33bf34f6e2764ada9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29276b43a2950ed71f0f9629a35dfa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e773ac3c6d9ce944132bc0b0001999fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06bde0c41c89ca5091b7a0843eb22a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
您最近一年使用:0次
2022-12-13更新
|
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3卷引用:内蒙古兴安盟乌兰浩特第一中学2023-2024学年高一下学期期中考试数学试题
内蒙古兴安盟乌兰浩特第一中学2023-2024学年高一下学期期中考试数学试题河南省新未来联盟2023届高三上学期12月联考理科数学试题(已下线)6.2.4 向量的数量积 (精讲)(1)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)
解题方法
3 . 如图所示,在菱形
中,
,
,
为
的中点,则
的值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/660aceca-3105-4865-b576-c190e847993d.png?resizew=131)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634e116ca7402e925c9af92a64045053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e0b64d25ddd18454f88e40c45d7d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36bc4dc59b3d71431f0081eff04ebae4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/660aceca-3105-4865-b576-c190e847993d.png?resizew=131)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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