在直角坐标系
中,已知点
.
(1)若向量
的夹角为钝角,求实数
的取值范围;
(2)若
,点
在
三边围成的区域(含边界)上,
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e624f357767077e634f7786739f98bf.png)
(1)若向量
![](https://img.xkw.com/dksih/QBM/2016/12/14/1619428294352896/1619428294893568/STEM/2f3c71da8fde462c9845c295efd8de31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28965097a2c8f6872accc5ba80f44dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2016/12/14/1619428294352896/1619428294893568/STEM/0f0b57c164ca47d2804adfe7f305f5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72850427e83ff19a24305783e080b280.png)
更新时间:2016-12-12 14:06:25
|
【知识点】 平面向量的应用举例
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