已知
,
,且
与
夹角为
,求:
(1)
;
(2)
与
的夹角的余弦值;
(3)若向量
与
垂直,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787379f7ff8d24be7eebfea1cfe956d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2396cac4b185cf1f1a67dad9248481c.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/2d5bca00fa20e6e80480b9d06d2e52ee.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3db87f99222f1705e122a6bd329c9f1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa53e6f54e190da611f9f18ee20076d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33044e818d70b6b8b968a9a69a4811d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
更新时间:2023-04-14 17:31:18
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解答题-问答题
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适中
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【推荐1】设
是不共线的单位向量,且
与
的夹角的余弦值为
.
(1)求
;
(2)若
与
的夹角为锐角,求实数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d65581099af0b86670124368dc4b95.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40436543cc51f42b5b5d93e55a407ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31b07a2081bfaaf77c0062193ab173e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知三角形
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,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e842fe98ec9ded46916a7443969495e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577b2110970dd65a5cf5c8a2c029d376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe86b7070c396441232912c96238d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3578b63c5903089595bf324c809a997c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
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【推荐1】若
,
是夹角为
的两个单位向量,
,
.
(1)求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6276db8f33004a730629e6fd3f0bed4a.png)
(2)求向量
,
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d101f983a2eddc559755390539483ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7439be96efb0ac5602c18f7b2014f71.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6276db8f33004a730629e6fd3f0bed4a.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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【推荐2】已知
,且向量
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不共线.
(1)若
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,求
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(2)若
与
的夹角为
且向量
与
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d692fa5fdbb7896aed3feee96eb9810e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(1)若
![](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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a461d4b4d3b24abaedd8d543ab97e99.png)
(2)若
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff01c3e3b53271c5d16ad4e02a930ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2e08d0ffb3a2147fb1ba5145471082.png)
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解题方法
【推荐3】如图,在矩形
和
中,
,
,
,
,
,
,记
.
![](https://img.xkw.com/dksih/QBM/2023/11/11/3365677006725120/3366255125012480/STEM/c0c985ee9c1d43d5a48552c4bcfa22bc.png?resizew=172)
(1)将
用
,
,
表示出来;
(2)当
时求
与
夹角的余弦值;
(3)是否存在
使得
平面
?若存在,求出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f7989cde594efacb775fb7c2431a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b8761da9720f81021c73d4b373e68f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5d3dc99adbc61c7265b98bb8b4da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9698abe469047f6ffbcbe1c816b97ef4.png)
![](https://img.xkw.com/dksih/QBM/2023/11/11/3365677006725120/3366255125012480/STEM/c0c985ee9c1d43d5a48552c4bcfa22bc.png?resizew=172)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.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/73a0b19e69be46452425916a0fcb49c9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐1】已知向量
与
的夹角为
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,
.
(1)求
;
(2)若
和
垂直,求实数
的值.
![](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/cd18461fd9d77e6fa46a654f0ab540f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082c6926889f84f438ea35f70bf05f02.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4f1d016e1b3849a0817c836a5c9284.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc9711b426412811c6bc6b0f2494f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8036c25d0266c38ed514406ea546a189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
【推荐2】已知向量
与向量
的对应关系用
表示.
(1) 证明:对于任意向量
、
及常数m、n,恒有
;
(2) 证明:对于任意向量
,
;
(3) 证明:对于任意向量
、
,若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0de95dc888471ed33cf137b5284226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a8dfa429b6e5f3cff30d07431158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97438095118901a45782f8991d0569f.png)
(1) 证明:对于任意向量
![](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/9b6d0c10c2ada5afd8d1dbefe982dc9a.png)
(2) 证明:对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f17f88b6a6ade833b7728f9c3ba9a30.png)
(3) 证明:对于任意向量
![](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/4bb58883caf5c8ca1e94389839d294b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e236b7f70541f9ba31d9bf4a570fdcfe.png)
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