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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2020·全国·模拟预测
名校
2 . 根据《周髀算经》记载,公元前十一世纪,数学家商高就提出“勾三股四弦五”,故勾股定理在中国又称商高定理.而勾股数是指满足勾股定理的正整数组
,任意一组勾股数都可以表示为如下的形式:
其中
,
,
均为正整数,且
.如图所示,
中,
,
,三边对应的勾股数中
,
,点
在线段
上,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ce11f21a22b45f11e27b489ecb9a84.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a57d1215099fab4a97db12b2fa8f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585ca3b34ef9a7acdb1709b59b4767b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7459cac5a01a137bff696095281e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c238c5064e3340550edd0e673e95fd97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6c3ea24743e594cc3b0fdd3877d88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ce11f21a22b45f11e27b489ecb9a84.png)
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2020-11-25更新
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