1 .
是单位向量,且
,若
,
,则向量
,
的夹角为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4868d6790066750d6fc1b361b41bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a6b595e8e8969a0b762f493642e4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003ff99c50566c347765bde4ed16d09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889e16c4a7a67a100276510dff7db34f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
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2 . 设平面向量
,
,若
与
的夹角为锐角,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6b9c4b620f3b8f6878a1370f6d44524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3dfffcecda7289a3707e70e44f4be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-11-10更新
|
1588次组卷
|
7卷引用:沪教版 高二年级第一学期 领航者 期末测试卷
名校
解题方法
3 . 直线
与直线
的夹角的大小为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1d69d7976b9ee5c6c1ebe7756e5a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a1f45fa5a8c7d00445fb75687ad864.png)
您最近一年使用:0次
2020-03-06更新
|
414次组卷
|
3卷引用:上海市控江中学2015-2016学年高二上学期期末数学试题
上海市控江中学2015-2016学年高二上学期期末数学试题沪教版(2020) 选修第一册 精准辅导 第1章 单元测试卷(已下线)第1章 平面直角坐标系中的直线【单元提升卷】-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)
4 . 如图,在三棱锥
中,
分别是
的中点,若
,且向量
与
的夹角为
,则棱
与棱
的关系是
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625389000851456/1626812347187200/STEM/ffa8b20d6afc4fe18644735b8e4e93a8.png?resizew=205)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32444482455132f94554b1f6d686adea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b5a51e65e9b56a9970de33ead263a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed9c2e9fabbfc63733bae8fa079d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625389000851456/1626812347187200/STEM/ffa8b20d6afc4fe18644735b8e4e93a8.png?resizew=205)
A.![]() | B.![]() | C.![]() | D.无法确定 |
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