互相垂直且有公共原点的两条数轴构成平面直角坐标系.如果坐标系中两条坐标轴不垂直,那么这样的坐标系就称为斜坐标系.如图,设
是平面内相交成
角的两条数轴,
分别是与
轴、
轴正方向同向的单位向量.若向量
,则把有序数对
叫做向量在斜坐标系
中的坐标.
,求
;
(2)若
与
的夹角记为
,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c092d69df76faf1e2133dc96b466ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5253a9a71037d60059b60237824193b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1b27f67a2190739f8fe8d71ad22652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b39413539656b05f7f5ec6e3fe0b0a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe98724f0d478f589425ac0b7b3066a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8a88a16125366536cb4ad658e0cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
23-24高一下·福建·期中 查看更多[2]
更新时间:2024-05-19 12:08:14
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(1)
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(2)
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【推荐2】已知向量
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(1)求
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(2)求
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【推荐3】已知
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【推荐1】已知向量
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【推荐2】设两个向量
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(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
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