已知向量
,
,
是同一平面内的三个向量,其中
.
(1)若
,且
,求向量
的坐标;
(2)若
(
),且
,求
与
的夹角
的余弦值.
![](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/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172014fe535f3d3095bfc9cf9a51de6e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec41eae333bbceddb0da14c824324d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ed09a3299bfa679e1b77047cb50bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4c996dee85e4c876bd2b95d659a097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35325b12aded89037f86f59e57c8c97f.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/c24095e409b025db711f14be783a406c.png)
更新时间:2021-01-23 15:02:28
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适中
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名校
【推荐1】已知在平面四边形ABCD中,
,
,
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.
(1)求∠BAD的大小;
(2)设点E,F分别在线段DC,CB上,线段EF的中点为M,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b54a558e7d00ac102b3509884127d0.png)
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适中
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【推荐2】已知向量
.
(1)若
∥
,求
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(2)若
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c86f45ad94a01938a8d38b72cfb602.png)
(1)若
![](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/43660b1543b3a2b46185f7629d28a963.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05f1d68b133c5d2f76a06186e0ffb08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de6460673e82a39ddd43c662e0ce7da.png)
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【推荐1】已知
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(Ⅰ)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38fe2c71e008615306cd00dd26ac34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8179ef272b66636dd82097446257c0.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d8b04432d7f1747760cfb21d30b322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d623c202fbd7d82baff5257c8f0ec10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d220bd498984d256a640f8283ba8e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1778bc2e46bc217975b4aef812e007c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c67374e327bef38ce5da6ce4d565e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deae5171eb718a10261d9b632aa7c2ca.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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适中
(0.65)
名校
【推荐2】已知向量
是同一平面内的三个向量,其中
.
(1)若
,且
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(2)若
是单位向量,且
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与
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d171c0b75d097413232a4a5332d03e1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b889311e281d855090dd1096f920c4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd43c3c9a578b91fe832c4c2477103c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb9e6b6ec47e6649b945db2a6d7ad72.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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(0.65)
【推荐3】试分别解答下列两个小题:
(1)已知向量
和
都是非零向量,且
与
垂直,
与
垂直,记向量
与
的夹角为
,求
.
(2)在
中,内角
的对边分别为
,若
.试将
表示成关于
的表达式,并求出
的取值范围.
(1)已知向量
![](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/cd9534eb6ae67a9a2ef6ba5eaf9cfcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec855370060932ba189b68dea782a4e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab6ea7f5e7b6217d3bdcb4f35d741a7.png)
(2)在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d4cbfc00ff1b4016bc51b6704f6c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d4cbfc00ff1b4016bc51b6704f6c42.png)
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