解题方法
1 . 在锐角
中,角
所对的边分别为
,且
,则
=____ ,
的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238ccfc35ea5d7a594201e0daa299f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e09b00b25833d9d3b4bad8efb20be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1db906824e53395f016622f21efdb11.png)
您最近一年使用:0次
解题方法
2 . 在平面四边形ABCD中,
,AD=3,BD=
则CD的最小值为( )
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962341537783808/2963019477090304/STEM/1fb5cd51517947b4bdd4156f5d66cd6c.png?resizew=124)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0397e97ae23086b716955677e5d2b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e6071d9fdc3cd10a612ff07dc76177.png)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962341537783808/2963019477090304/STEM/1fb5cd51517947b4bdd4156f5d66cd6c.png?resizew=124)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2012·河北唐山·二模
名校
解题方法
3 . 已知向量
,
,角
,
,
为
的内角,其所对的边分别为
,
,
.
(1)当
取得最大值时,求角
的大小;
(2)在(1)成立的条件下,当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159446bf8e91dcab30516c1cc256081d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11db2da76228910a49013089d2d00117.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f9dedbc2e63c621bd92abc6e0a7c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)在(1)成立的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfa04ed69eb5e36931c076e0cf3f01e.png)
您最近一年使用:0次
2018-07-16更新
|
2408次组卷
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9卷引用:江苏省扬州中学2020-2021学年高一下学期期中数学试题
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