已知向量
,
,
,且
.
(1)求实数
的值;
(2)求
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db31b05cd6e12ee15c9ab1219eedcbec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9364968214f6c75cbfa29090e858eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d06a7307864569ea431036e2bec04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a144471d22918482b8408aafd380bf68.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
更新时间:2021-07-15 09:00:39
|
相似题推荐
【推荐1】已知向量
,
.
(1)当
时,求
的值;
(2)设
,若
,
是方程
的两根,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf5df577fbed4dbe1ee6073374c26f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a5053c4b6405aea48d20941604f259.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70facc9bc02af0867d248407bd317c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b270bf9e2908fb7aa39a0351d4862f3b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58943c67d05b9d06138b8f310b4e06fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb381ac86308c6249bc7e8737cdc668d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36a46d416b49b12077d4ab8e888b680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】在平行四边形
中,
,
,点E、点F分别为边BC和CD上的动点.
(1)如图,若平行四边形
是矩形且点E、点F分别为边BC和CD上的中点,求
·
的值;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/d941fb70-7d15-4f6f-9d3b-99456ee5d5ea.png?resizew=119)
(2)如图,若
,
且
,求
·
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c91c961e70e3a97c51597bd87e04fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39a1656fd1ad0c8da267808d16ce54a.png)
(1)如图,若平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00b863991d441829e9ccbc21a796301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3415429304cf6733cd7bd5d9927af1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/d941fb70-7d15-4f6f-9d3b-99456ee5d5ea.png?resizew=119)
(2)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64fdbcbeca55ada5509aae3d383c4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876731ebefbcea75ec40ffea52eeeb4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00b863991d441829e9ccbc21a796301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d538446124353976bb32f44a45635c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2169539a-7248-4f2c-82e2-05b41caa4f35.png?resizew=169)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】
中,点
、
、
.
(1)若
为
中点,求直线
所在直线方程;
(2)若
在线段
上,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1282cc43ebf4b459832fec04d805989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8102c14d4f3cc802c634fbcf829c2d0b.png)
(1)若
![](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/03902478df1a55bc99703210bccab910.png)
(2)若
![](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/44399bddd012b809ae5f95518c9bee28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045fab982486b0dbb57969a7546759f7.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知向量
,设
.
(1)
,求当
取最小值时实数t的值;
(2)若
,问:是否存在实数t,使得向量
与向量
的夹角为
?若存在,求出实数t;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07ab4e0397f372a019fcbf89e4ec2ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223d69a5f1605412d0781b4a8080a9b9.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e2c8d466ab8eb5ecd38060b53bbe8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdf5c74658cbba0bdb075f6384d9c60.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560ee2894ba8c5cee6633430cc8b3b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐3】已知向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f1b1d236c77645c4a610c7c45a0b89.png)
(1)设向量
与
的夹角为
,求
;
(2)计算
在
方向上的投影;
(3)若向量
与向量
垂直,求实数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec0d30252d9cd1ebf9e5c894ce47f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f1b1d236c77645c4a610c7c45a0b89.png)
(1)设向量
![](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/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b278158157e3e0b59a4eeba058b515f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知向量
,且与向量
的夹角为
,其中
、
、
是
的内角.
(1)求角
的大小;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de052291b4f2d8c840e6cc9749b8440b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6435710303c6143b65251707c1188b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0577566dbcc526fb6f783491a4784902.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知向量
,
,求:
(1)
;
(2)向量
与
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d607667f2516c58bbdff03e01be50f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3bb7ccb422f0c02385a5adcd1606c8.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffc403ded5faedb326b83d5d3f69a30.png)
(2)向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐3】已知三角形ABC,A(3,4),B(0,0),C(16,0)
(1)写出一个与
垂直的非零向量;(坐标形式)
(2)求
;
(3)求向量
在向量
上投影的数量;
(4)若
,求k的值;
(5)求
.
(1)写出一个与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ba913238f9aaa01696586b618ac20c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
(3)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ba913238f9aaa01696586b618ac20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1da92a2fc2ce861e82f7192fe4e648f.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd8996e239a0520de35d456b74051ce.png)
(5)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f034118c3767055d45a6592052ce43c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知向量
,
,且
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b377f632949bff36083a5464113387fe.png)
(1)若
与
夹角
,求
;
(2)记
,是否存在实数
,使
,对任意
恒成立,若存在,求出实数
的取值范围;若不存在,请说明理由.
![](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/fbd91fd0818516ea4763c1567079151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48eaee30b41ac62aafea29803983cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b377f632949bff36083a5464113387fe.png)
(1)若
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0958658d052b674175d598d1f1e4da32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda8e0bae2395f1f90447d2103515cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c32a341bb7f2597378df250b93efdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
名校
解题方法
【推荐2】(1)已知向量
,
,求
在
方向上正射影的数量;
(2)已知
,
,有向线段
绕点
逆时针旋转
到
的位置,若单位向量
与
方向相同,求单位向量
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d132d66b8f84001b23f57ce071f04fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97b78845dcc7c73cc69517ebae891f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d72c37a4a3a308e1f019a7b5074785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215e52cd8cf624e9dd412978fe4e81a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49f8a63ddbca52039fa9ab44cda6b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f858109018e7cd82517d248c6f2fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b680f91c4a693cc9ab2c23f2e9114ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f858109018e7cd82517d248c6f2fd2.png)
您最近一年使用:0次