已知向量
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f310de0d0eb960c113c09173eef132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f33380ddc916431a0cc39f8f394a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96751d97052ff2a5c592d81d12c377cb.png)
A.4 | B.2 | C.![]() | D.![]() |
更新时间:2024-05-01 22:00:39
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【推荐1】若向量a=(2,1),b=(-2,3),则以下向量中与向量2a+b共线的是 ( )
A.(-5,2) | B.(4,10) | C.(10,4) | D.(1,2) |
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【推荐2】对任意平面向量
,把
绕其起点沿逆时针方向旋转
角得到向量
,叫做把点
绕点
逆时针方向旋转
角得到点
.若平面内点
,
的坐标分别为
,
,把点
绕点
顺时针方向旋转
后得到点
,则点
的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474b926643229f915a0a789de710389c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe35c91649a5bea2518387a2b36e0c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2628e3c335b288ca0232e65aefe142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/31ea4edb43ed51e84f8f5ae5b6a4a841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b54b9cf95418bc3dce6e4c698b9907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
【推荐1】已知向量
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914c735f9c59a399c635a6ff24c35254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89db934fbfbcb264cf37cafc0814e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
A.1或4 | B.1或![]() | C.![]() | D.![]() ![]() |
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解题方法
【推荐2】已知向量
,
,
,则实数
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abda10f0d784685750b179029e4b3272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bfa9f707159864b8b3e2f308493738e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c117612b878a943b482d9604c6fc092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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