名校
1 . 已知平面非零向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86641f795d019d281e2996e8f6652aa.png)
满足:
,
在
方向上的投影为
,则
与
夹角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86641f795d019d281e2996e8f6652aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b989e70df9dded1bf4bfb10ede3f38.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/5fcfc6fa41dcbaf81e80a05b3461d74c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-02-07更新
|
1928次组卷
|
6卷引用:陕西省榆林市绥德中学2021-2022学年高二下学期第二次阶段性测试理科数学试题
2 . 设向量
满足
,
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38fe2c71e008615306cd00dd26ac34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7b8925a75bc1ef601edb37dbfb9f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3bdb62d54227999dab3761453c755b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb58883caf5c8ca1e94389839d294b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7143c24a0f6abee7f14a3f1a8ddbb467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8227f577623f308ffe065783ba0b3d.png)
A.3 | B.4 | C.5 | D.6 |
您最近一年使用:0次
名校
3 . 设
,向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1244163a12829ef3c30177b1c0929506.png)
,且
则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1244163a12829ef3c30177b1c0929506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc223ee0b4e79abc1b368b0131c6292b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0970f3cac584d2e924ca3fff9bb979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a6ba33bce399a92ce3c30ccb7f25ec9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-09-21更新
|
459次组卷
|
2卷引用:陕西省安康市石泉中学2020-2021学年高二下学期开学摸底考试理科数学试题
名校
解题方法
4 . 已知椭圆
的左、右焦点分别为
、
,且
,点
在椭圆上,
,
,则椭圆的离心率
等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2d4ff799e2f87b3786a04c83f63d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618b3a844ae7dc525aebea73bd96efda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c0478b592805d94bf11e271ef9f35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
您最近一年使用:0次
2018-03-15更新
|
712次组卷
|
3卷引用:陕西省西安市第一中学2017-2018学年高二上学期期中考试数学(文)试题