已知向量
,
满足
,
,且
在
方向上的投影为4,现有如下说法:①
; ②向量
与
夹角的余弦值为
;③
,则其中说法错误为________ .
![](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/6f4c774cd13b4b2458c8a444f9890200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082c6926889f84f438ea35f70bf05f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3dcdb057232bb2fb680af5196281e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b683e1a248b1d81140aa526897ab.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/1d86ab7c97cd8a0b15ba5efc1be94230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324f61c34d7a7e15a9a98b2f11a097f8.png)
更新时间:2021-02-06 20:37:30
|
相似题推荐
填空题-单空题
|
适中
(0.65)
【推荐1】在圆
中,
为圆心,
,
为圆上的两点,且满足
4,则
在
方向上的投影向量的模是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/88bee8e70f1fab639be1636c7bce0477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7f004f23ec3f968d885cb111aac4e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】已知
中,角A,B,C的对边为a,b,c,现给出以下四个命题:
当
,
,
时,满足条件的三角形共有1个;
若三角形a:b:
:5:7,这个三角形的最大角是
;
如果
,那么
的形状是直角三角形;
若
,
,
,则
在
方向的投影为
.
以上命题中所有正确命题的序号是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c512c047783c07da1d4f4455a4033ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2ad4acb740916f0d61ef3654b0410e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2835bc37b32c722ab52cba7caa87ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b9a58d5676455dfa6cb96f8c0eb636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876959b9f90f2379cf3d0927a8e31005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb26e9b3402f35028d41d86d0a0e874b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c31a46b9780b063b83f65d68e4671b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67773252101fb3704fdac88b5f3f1bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1450b160e9ae9213f620b5cd227c081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74269cfb503e736149e1ac3165fcbafa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5474472b5cded853e140be6dc63b389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a678b621f6bac1073dc27c461901e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1872df0b08ffa15bf61957572e7b980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d1f4111a0655e2ce6e4913f1a80182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0db4603f3826a9e523ba01bbd609bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575fdebc8f8ad46f80ec388e1784ee23.png)
以上命题中所有正确命题的序号是
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐1】定义:
,
两个向量的叉乘
的模为
,
表示向量
与
的夹角.若点
,
,O为坐标原点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02de02ded0bc849c832c560798ddd099.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/7dc11d170d9af305d1961166be479996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e329c5381247c9342c9e25c83bf2403f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ccf063f8ee5646216c6caf10f03d767.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/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f757fea58850715d73c8648adad7dd1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02de02ded0bc849c832c560798ddd099.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐1】在
中,
,
,AC=2,设点
满足
,
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392e7a97bd1afd55bb421fc50d37aeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b266c93afa30a46dbf23b1198ff5f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd9736828195f010db4e1f0a9dea7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49fda3328bf70ae0205b77df7937c9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】已知向量
,
的夹角为
,且
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6b474b6957c119e1cf5cfb0bfc8f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df13687ff5652e3f0e7343851ad7f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
您最近一年使用:0次