已知平面向量
,
.
(1)求
与
的夹角的余弦值;
(2)若向量
与
互相垂直,求实数
的值;
(3)当
为何值时,
与
共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cb17403fe59a0e1a93df381aed40cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c738f54e4d188f3e266424940d3c0c2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d5d06c8ba359e2f95bd6abbeb9d696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff01c3e3b53271c5d16ad4e02a930ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40436543cc51f42b5b5d93e55a407ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
更新时间:2023-04-09 11:43:56
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相似题推荐
解答题-问答题
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解题方法
【推荐1】已知向量
,
.
(1)当实数
为何值时,向量
与
垂直;
(2)若
,
,且A、B、C三点共线,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6569e50f43b3d8645652ecc13b62066e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b12729dbc8aac5c77094d76576a351b.png)
(1)当实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41960bbc66bdc3b28be0138f83f9de5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03adf3fa0262d9bd46a2c794eb15746.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6cc0c1db640053f18c4f4afc06577f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b00161babf230108ff949be03ea3110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】设
为平面直角坐标系中的四点,
为原点坐标,且
,
.
(1)若
,求点
的坐标;
(2)若
与
平行,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4594a9943a8ab0ff38abef9af7ba37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6863b8ffae1d04273897253fc6fdf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1adcbd17238c9223a17543fd39e709.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8051e01cda5804a35213cf6d6bfb9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c849231c400a0e1aded93df984bd9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a125e85811b659d2df14ebbd0cde29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知平面上三个向量
,
,
其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d769ab21af5365d3c00dc617375ce4.png)
(1)若
且
,求
的坐标;
(2)若
,且
,求
与
的夹角
的余弦值.
![](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/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d769ab21af5365d3c00dc617375ce4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6780cc35c702ace628076c44f31a02f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fde8e39a2679babf24eb124ddda20ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892eee2a37bb2395d0485ccd5d233bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5b86c8f88b19cdf84845465a35ed78.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/c24095e409b025db711f14be783a406c.png)
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【推荐3】已知
的三个内角
,
,
所对的边分别为
,设
,
.
(1)若
,求
与
的夹角
;
(2)若
,求
周长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ad2c5f299b2b50dcabeb85008e1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4512dd9434ea328d99cd66d0d7e3bfe.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232a58591ad66a264c29d47ebd90e03c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560ee2894ba8c5cee6633430cc8b3b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f1a8e551cba7ec9f451749f60e628d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7b8439480f238ef7daf5bc2ca39453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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解题方法
【推荐1】在
中,角
所对的边分别为
、
、
.若
=
,
=
,且
.
(1)求角A的大小;
(2)若
,三角形面积
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560ee2894ba8c5cee6633430cc8b3b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebac0aef13b2189881a84824bf4bcd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f1a8e551cba7ec9f451749f60e628d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ce653a2b88281ca2894ced27679699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7762022b5c9f810dc7698205bf69993.png)
(1)求角A的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa79a550591eb9e1bd07bced3a08fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2dd89c37b60b4596ac30e339aa0000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
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【推荐2】已知向量
,
,向量
与
夹角为
,
(1)求
及
;
(2)求与向量
方向相同的单位向量
的坐标;
(3)求
在
的方向上的投影.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a5fe0699e4bac2f36e830c38a8ccc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ef9f7f62c00bf7d33d53872472c35f.png)
![](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/c24095e409b025db711f14be783a406c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a560b8ff794c12dc8d194bcd2e3f3554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
(2)求与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3cc805723d3ecc95b4472d13bb1bb6.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
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解题方法
【推荐1】已知
是同一平面内的三个向量,其中
,若
.
(1)求
的值;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96022a881e03e32d3483d997c3f170c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6304999346b860e04991de41193b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14d829cf19ffa06dec548e21d0cc22e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c306c8d055a3c57b625dd06a7d280bec.png)
您最近一年使用:0次
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解题方法
【推荐2】已知向量
,且
.
(1)求
的值;
(2)求向量
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be404826610dd2a8aa32702e3bf44ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229aafebfdd6b8a111413d60c7152960.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5548597b19f02d7b20837d7ad7de24.png)
您最近一年使用:0次