已知向量
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e2759b7769f63d56d63e228d749842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7932118be1aeb455f3b06c6e0c447b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b195aa36a3c2753ebf08cb464c52ad1e.png)
A.![]() | B.1 | C.2 | D.![]() |
更新时间:2020-09-17 13:42:03
|
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单选题
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适中
(0.65)
名校
解题方法
【推荐1】已知
中,内角A,B,C所对的边分别为a,b,c,已知
,且
,角
,则
的面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】在平面直角坐标系中,坐标原点
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,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4fc6b329686fdbe10f5fed9e79b63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ab5a64f96b611dad9f756ab8702322.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】已知平面向量
,
为单位向量,且
,则向量
在向量
上的投影向量的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de07c39ba6e4e2a3a7cd08fcff5de235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c26e8b9a81f84c43d36b0c3f87cd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】已知
,
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=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8315ec34019d719771152be2252106e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf39ca3294f5520518dd4f1c0609876.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e6b4f9ae0fc7abd80961df81fbda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7456b3125e375acb5f2545133ab2ed7c.png)
A.定值-1 | B.定值1 |
C.最大值1,最小值-1 | D.最大值0,最小值-1 |
您最近一年使用:0次