△ABC的三边长之比为
,则最小角和最大角之和的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea30f63e62ad808c69798e89a7b30472.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-05-02 14:56:55
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单选题
|
较易
(0.85)
【推荐1】若
的两边长分别为2,3,其夹角的余弦为
,则其外接圆的面积为
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A.![]() | B.![]() | C.![]() | D.![]() |
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单选题
|
较易
(0.85)
名校
解题方法
【推荐2】在
中,角
、
、
所对的边分别为
、
、
,设
为
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A.![]() | B.1 | C.![]() | D.2 |
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