在
中,若
,
,
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c872a301e855b9e84321fdf4fee87f8.png)
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2024高三·全国·专题练习 查看更多[1]
(已下线)大招6 投影法速解向量的数量积问题
更新时间:2024-05-24 00:50:56
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填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】如图,在三角形
中,已知
,
,
,
,
分别为
,
中点,
,
相交于
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
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适中
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解题方法
【推荐2】在△ABC中,D为AC的中点,若cos∠DBC
,cos∠DBA
,且
•
2,则
的值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2dcc5a28daac51d2e32aea8ab9ba7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e9368e62640498b794a52737c453c.png)
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填空题-单空题
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适中
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名校
解题方法
【推荐1】已知向量
满足
且
,则
在
方向上的投影向量为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc96d4f8fc3ba8720254f398188ae98.png)
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填空题-双空题
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适中
(0.65)
解题方法
【推荐2】设
,
是两个非零向量,
,
,过
的起点
和终点
,分别作
所在直线的垂线,垂足分别为
,
,得到
,则
叫做向量
在向量
上的投影向量.如下图,已知扇形
的半径为1,以
为坐标原点建立平面直角坐标系,
,
,则弧
的中点
的坐标为________ ;向量
在
上的投影向量为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
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