已知向量
与
的夹角为
且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331048f0ecd3d205d517ce8f8bf8c179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28280aaac77be24aa72379e49b6f01e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbcc0fa4b480c43e9a66273898c9a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331048f0ecd3d205d517ce8f8bf8c179.png)
A.2 | B.![]() | C.![]() | D.![]() |
更新时间:2018-02-11 09:51:49
|
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解题方法
【推荐1】已知
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8917a84a9c4c3b08b73aefe3506ea1.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
名校
【推荐2】如图,在任意四边形
中,其中
,
,
,
分别是
,
的中点,
,
分别是
,
的中点,求
=( )
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749134422761472/2782500836507648/STEM/60d8618b61e6470ca13fa96b260b7e22.png?resizew=178)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐1】在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba656e791ebe79d099a4258a5e021f9.png)
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您最近一年使用:0次