名校
1 . 已知平面向量
,则下列命题一定正确的有( )
①若
,则
②若
,则存在实数
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6836870d047ff2faeea5d05721f4058.png)
③若
,则
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a801d21dab86af22e289081213703fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0a32446aed06817f5f72abf7fdae4b.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286264a49cd533a67033cfe532b80108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994b645edf923a6644eb540c1f4a8dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d76ee2e81f447f84a3e0b39c0388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6836870d047ff2faeea5d05721f4058.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f97c8e44527c0b2d0252be8ba4729c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fde8e39a2679babf24eb124ddda20ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a801d21dab86af22e289081213703fc.png)
A.0个 | B.1个 | C.2个 | D.3个 |
您最近一年使用:0次
解题方法
2 . 已知
,
,
.
(1)求
;
(2)若
,求实数k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e310702748855c3edccd151aae0143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b532ff725ed321148010644e7f0e05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7901fc86cb98cdb030d6ee72816dc14a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b195aa36a3c2753ebf08cb464c52ad1e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28366bd942f564a8bc3396dc85b1b73c.png)
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解题方法
3 . 已知点
是
的重心,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fa7cf81e740ecf17749d039e10ed46.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba1df94176a1f769c7a0a12bf357fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fa7cf81e740ecf17749d039e10ed46.png)
您最近一年使用:0次
解题方法
4 . 已知向量
,
满足
,
,
,则
( )
![](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/3aa3610a990287d3ac756abae406540d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2396cac4b185cf1f1a67dad9248481c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002f134205b8ceb99621b89ecdc09fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e59a901bd91f7e1bac71a7b299b5a4.png)
A.3 | B.![]() | C.6 | D.![]() |
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解题方法
5 . 已知
.
(1)求
与
的夹角;
(2)若向量
为
在
上的投影向量,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e395ca3cd8e7456e1b5960af27f874c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b970dbe07e6fd22ebe4fe0a56a784f.png)
您最近一年使用:0次
名校
解题方法
6 . 已知向量
与
的夹角为
,且
.
(1)求
的值;
(2)若
,求实数
的值.
![](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/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380be26ed3df021b0f5b57ce1fc4e344.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc2475b065cfc88e27419a65b2d842.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f82b38124309fa742184532f1df5695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
7 . 已知向量
,且
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d4cc7d747d5838ab823b91bac1bf39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc2176e43e22f57f642c22e61c36688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.6 |
您最近一年使用:0次
8 . 已知
中,
,
,
,则
在
方向上的数量投影为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0dbe0dc30f7be260e24acb67f89abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
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名校
解题方法
9 . 已知边长为1的正方形ABCD,点E,F分别是BC,CD的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0d84e7f64f2ad466051a7e1adf69f2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
10 . 若向量
满足
,
,则
在
上的投影向量为______ (用
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da55c225932dfff8999c7a67ef87c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cab4a159676f892d37605751744abad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
您最近一年使用:0次