已知
,
,
,则向量
与
的夹角为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f14dfa9f463d57664c640102bb5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7e9a7c6bd5ba08238318a7c7df02c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1606d4cbed2aa19713f5b3482ee798e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
更新时间:2023-08-23 18:37:08
|
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填空题-双空题
|
容易
(0.94)
解题方法
【推荐1】已知
=(2,3),
=(-1,k).若|
=|
|,则k=______ ;若
,
的夹角为钝角,则k的范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0db4603f3826a9e523ba01bbd609bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d1f4111a0655e2ce6e4913f1a80182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460831eb84926c2cbd3acf47074f4ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d1f4111a0655e2ce6e4913f1a80182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0db4603f3826a9e523ba01bbd609bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d1f4111a0655e2ce6e4913f1a80182.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
名校
解题方法
【推荐2】向量
,
满足
,
,
,则向量
与
夹角的大小为___________ .
![](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/cd18461fd9d77e6fa46a654f0ab540f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b72494c40e9c7afffd5238fd53e2e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf05f6045b0221157326a068449abe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
您最近一年使用:0次