记
的内角A,B,C的对边分别为a,b,c,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ce6a808fa7b3384a462d4e25975548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88de527b00d11a61b70679595630975.png)
A.![]() | B.![]() | C.![]() | D.-2 |
更新时间:2024-05-18 17:05:12
|
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【推荐2】已知
,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3955978f611908709aa2045b897b5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804ca4f8c541b6208cad78b60298456a.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知椭圆E:
(
)的左焦点为F,A、B两点是椭圆E上关于y轴对称的点,若
能构成一个内角为
的等腰三角形,则椭圆E的离心率
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在
中,内角
所对的边分别是
,若
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516983449108347c9bbf5dd2a72ab3dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90d7f054e8f0346479e1999622f11cf.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,某公园有一个半径为2公里的半圆形湖面,其圆心为O,现规划在半圆弧岸边取点C、D、E,且
,在扇形
区域内种植芦苇,在扇形
区域内修建水上项目,在四边形
区域内种植荷花,并在湖面修建栈道
和
作为观光线路.当
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的最大值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/bd827eb6-e05c-403c-9f4c-9e7ee2c15d3f.png?resizew=164)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1eaa24f808cb03226780d82e418c898.png)
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A.![]() | B.4 | C.![]() | D.6 |
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解题方法
【推荐2】在
中,
,
,
为
边上一点,且满足
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4bc0a1f9aadaa78c794e6ecceca3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5656661f1d7fd5b403d1dd39d1adfd.png)
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A.![]() | B.![]() | C.4 | D.![]() |
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