名校
1 . 已知
和
是两个互相垂直的单位向量,
,则
是
和
夹角为
的( )
![](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/66b6d63b846f8d19a7afe19cacf3ebb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d03149142fda4b23311ae538e88937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a3159579864a8ea0ab42005144864.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2023-03-20更新
|
535次组卷
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7卷引用:贵州省铜仁市2023届高三适应性考试(二)数学(文)试题
2 . 直线
与圆
相交于
,
两点,
为坐标原点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bebf204856cda96c1e07664179fc2b.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc523f751a40a21dece5645b15af9a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c1a6aada35b8c3676d3bb72b9cec42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bebf204856cda96c1e07664179fc2b.png)
您最近一年使用:0次
2019-05-09更新
|
1606次组卷
|
2卷引用:【市级联考】贵州省贵阳市2019届高三5月适应性考试(二)文科数学试题