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
是单位向量,且
,求
与
的夹角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7cad34fccd0fe584087604e863f352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcfb36af43abfb888d51d45d671d9d8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf6cb22a972c7aea195d630aa7ea6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4afbd0a6c3d12767376ef46d81416f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6609638b1ae47b4c47f6fd3e68ad9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
更新时间:2022-05-14 16:44:31
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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】给定平面内的三个向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539205e05dd465c98bc3402cd2c3c22f.png)
(1)若
,求实数
的值;
(2)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539205e05dd465c98bc3402cd2c3c22f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2e5e3506383fa335caadfc74b3525b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745e46404d9a9f1530e37989d569f6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知向量
,
,
.
(1)若
是以
为斜边的直角三角形,求
的值;
(2)
为何值时,三点
,
,
可以构成一个三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724bb9f081d011c99d368afa8ef32008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23c8c221361ffd26f988eacb2313a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7f0c2ca5f2248b2b953c68d0a8567d.png)
(1)若
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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)
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【推荐1】已知不共线向量
,
满足
.
(1)求
;
(2)是否存在实数λ,使
与
共线?
(3)若
,求实数k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ea10a57efb9cee06546ed8bf26a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc56f59971bd6f2fae7e76a91174d4a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0e3891d6867382343e539089ff6909.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4707e03a18c1c6ca514f7625b9369420.png)
(2)是否存在实数λ,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7931f05c072bf450b9ed46e77cbc1ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9e088ff80508fbf22d0da8428b4e72.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6163dad0e04715a63e86febf5125bd9.png)
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【推荐2】如图,在边长为1的菱形
中,
,E是线段
上一点,且满足
,设
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b54aa2b7f9adf409f0ce8e00615432.png)
![](https://img.xkw.com/dksih/QBM/2022/9/17/3068307350757376/3070529910300672/STEM/8df14857b8f1408986447779a4114673.png?resizew=242)
(1)用
表示
.
(2)在线段
上是否存在一点
满足
?若存在,确定点
的位置,并求
;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/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5528b4507ea0b52097e806d0e71e8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b54aa2b7f9adf409f0ce8e00615432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/2022/9/17/3068307350757376/3070529910300672/STEM/8df14857b8f1408986447779a4114673.png?resizew=242)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75fc81977aee721525b4c5625f5a097.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f8340f920decb68b1c4a1fa99488c8.png)
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【推荐3】已知
,
,
与
的夹角是
.
(1)求
;
(2)若
与
同向,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d769ab21af5365d3c00dc617375ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7ed656446eb408daa4e8419eba24c2.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/af9955b5aebb73cd84447e8541f901ac.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d010c3a30432c71ef5e30a5b566a0b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
您最近一年使用:0次
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解题方法
【推荐1】已知平面内的三个向量
,
,
.
(1)求
的值;
(2)若
(
,
),求
的值;
(3)若向量
与向量
共线,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dde9cb3c2c078d44940f226ca200762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b8583acf0b89997429dbbaa837c3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dc9f82e788085e0bb47709afd53785.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab432c05aa7a81b1e95a072cb1febabe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcc892622eecade579559c789253d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6612afffccf731637a818d5732e5ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d5d06c8ba359e2f95bd6abbeb9d696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d5fa4100a6b6e8e2c3605c97e6ee78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
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【推荐2】已知
,
,
是同一平面内的三个向量,其中
.
(1)若
,且
,求
的坐标;
(2)若
,且
与
垂直,求
与
的夹角
.
![](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/1a5618d27a4010782412bc0dbbda61d7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebc59d6f4f98c0ee00e4fb1d5f2fc27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d2cd576db6f49273ae6c59f3652cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b53f3869ee83375e6408ef94e109fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d108e523626be0b40be9b3543ce12524.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
,
为不共线的单位向量,
,
,且
与
共线.
(1)求
的值;
(2)若
,分别求
和
的坐标.
![](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/0b08ff4d206c38619a8a2378c71c1e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6236d3ca32baa2dfaecdf0eeb9991ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6abbadbd6b399c4657ea6ff8f00dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
您最近一年使用:0次