若
,
是夹角为
的两个单位向量,则
与
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9559b133927dd68c23db772fb061fb92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf321b9634a90680341dcf1938022b5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-06-22 15:30:57
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】在
中
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4552822970ef94db1e3ed75031ae2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
A.直角三角形 | B.三边均不相等的三角形 |
C.等边三角形 | D.等腰非等边三角形 |
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【推荐2】已知M是
内的一点,且
,
,
,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ee0da554e49ecd3b5aa91551a23766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d8332bf70ea360b452b85e20a7d081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b674b3ef097389dc5b59c548d92cff1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3194a9f0ef6ff9a5dd3287c1c702d4.png)
A.8 | B.4 | C.2 | D.1 |
您最近一年使用:0次
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【推荐1】把一条线段分为两部分,使其中一部分与全长之比等于另一部分与这部分之比,其比值是一个无理数
,由于按此比例设计的造型十分美丽柔和,因此称为黄金分割,黄金分割不仅仅体现在诸如绘画、雕塑、音乐、建筑等艺术领域,而且在管理、工程设计等方面也有着不可忽视的作用.在
中,点D为线段
的黄金分割点(
),
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8396ffa75e4fdfda5bd866afd2f452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f859f1ce4ae6612d7b39612ef8cac56.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】现给出以下4个命题:
(1)对于任意的向量
,都有
;
(2)已知向量
,
,
,若
且
,则
;
(3)已知三个非零向量
,
,
,则
与
不垂直;
(4)已知向量
,
,则
是“
,
中至少有一个是
”的充要条件.
其中正确的个数是( )
(1)对于任意的向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b63a6267e252e8d4c47cf1ad3363e88.png)
(2)已知向量
![](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/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dfd95b2e1d2c7f2a85fffe24f62686d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad11c6e4e26c73bfceede5477f11462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec6df8a1e8ccc7a0dc182efa0a53cdb.png)
(3)已知三个非零向量
![](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/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49df7fdd042d9e2a475746cec142dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
(4)已知向量
![](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/21a99487d41bb343a6a66849d4f5393c.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/1493ffc23d3c1bdd7ebb1e6b782313f6.png)
其中正确的个数是( )
A.3 | B.2 | C.1 | D.0 |
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【推荐3】
中,
,
,
为
的中点,
,
交
于
点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122fe84cfa345c1902231699c96beac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ce289c7cd2c004a200cfe5372d36b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐1】已知向量
满足
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d589af3739b9fca5229e0607bb5f6e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343bd7a03ef697056d9c5f402d87d9ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9ee73e05c2ea6a4b937b7ff42ac925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6429d3d84a8c1cef6a65ba723e1c7817.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】平面向量
与
的夹角为
,且
,
为单位向量,则
( )
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936a46cc891744d4600f76bb92b694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99db28b7a5a1b437b943e7f9ad9f894.png)
A.![]() | B.![]() | C.19 | D.7 |
您最近一年使用:0次