名校
1 . 奔驰定理:已知
是
内的一点,
,
,
的面积分别为
,
,
,则
.“奔驰定理”是平面向量中一个非常优美的结论,因为这个定理对应的图形与“奔驰”轿车(Mercedesbenz)的logo很相似,故形象地称其为“奔驰定理”.若
、
是锐角
内的点,
、
、
是
的三个内角,且满足
,
,则( )
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761151519342592/2764840447770624/STEM/087e51d1-5e63-4335-b97e-6fe598bc70e4.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761151519342592/2764840447770624/STEM/2ad46b81-7cce-42e8-a9f6-5f65b60a6e6c.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319b6a5373bc8eb13772b8e6d047779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea3c7cd2f23b4521e64a7e64844ec48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089e8a7f6c535fc3cd270af428d55f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa596729b1f446947b597557f6cc32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec832bb20c7265239f8736ce3fdc18d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40018175912da0930709934b329766de.png)
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761151519342592/2764840447770624/STEM/087e51d1-5e63-4335-b97e-6fe598bc70e4.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761151519342592/2764840447770624/STEM/2ad46b81-7cce-42e8-a9f6-5f65b60a6e6c.png?resizew=190)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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