已知向量
,
.
(1)若
,求实数m的值;
(2)若
为钝角,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d448794d6a1f2942195244ff38f4dcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4380fa512940311954f48d2a6ef4d60.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef84d275246c94cd7d9c983231210fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daef91a6dc58061db290e3264716e0c7.png)
更新时间:2022-07-13 18:58:54
|
【知识点】 利用数量积求参数
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【推荐1】已知平面向量
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(1)求
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解答题-问答题
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【推荐2】在平面直角坐标系
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca979687ffb2214e747525635a6912c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f56120e30c41aa77a37eb4d46f6390.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6898da43dfe3b05cb668d8369edbc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)设实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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