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
,则把有序实数对
叫做向量
在坐标系
中的坐标.若
,则:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/9de02700-61a0-4619-b546-9e4675020173.png?resizew=449)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83e95b9bb3592b073d01968e8b1ddf2.png)
__________ ;
(2)设
,其中
,且
,
的夹角为锐角,则
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14069d21d32c724f0ebe3e311f114c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b257fe21a91d22e853b1642c9d44647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0544b820f8f3095a7a5d4af207d87290.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/9de02700-61a0-4619-b546-9e4675020173.png?resizew=449)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83e95b9bb3592b073d01968e8b1ddf2.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e9ef3e6f57fe1cfbdb76a7bd1900c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995ec593baa4ef50b6d87c78380953d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2022-03-26 08:52:44
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