名校
解题方法
1 . 已知
分别是
的角
的对边,
.
(1)求证:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](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/4d6d8d358686e32b9858d889a259638b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b246aa3b56becc905d3fb64c6d5ec4a.png)
您最近一年使用:0次
解题方法
2 . 设
中,角
,
,
所对的边分别为
,
,
.
(Ⅰ)证明:
;
(Ⅱ)若
,
,且
,求
的周长
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63471f592531e46277365ed319e2acc.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e15cbd7c42d7b15d7ba8d2b28ab8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb75557d217f59ef1f33e8da1ac0d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9cbf8d0fb00e43f0496592a075a3352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2020-11-24更新
|
282次组卷
|
2卷引用:天一大联考(河北广东全国新高考)2020—2021 学年高中毕业班阶段性测试(二)
名校
3 . 如图,在△ABC中,
为
所对的边,CD⊥AB于D,且
.
(1)求证:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2224277a250dcec6368d0e88a0fbf21.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17d8fa87f8375e346ac9550e2bc0d2a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfeaf26f178031f78a5545233a2a73f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
![](https://img.xkw.com/dksih/QBM/2018/5/25/1953107742081024/2007656973033472/STEM/c9a6a87fd7f145fa8e7ba9bfe49ea0df.png?resizew=154)
您最近一年使用:0次
2018-08-10更新
|
3864次组卷
|
9卷引用:江苏省南通市2018年高考数学模拟试题
名校
4 . 在
中,已知:
,且
.
(
)判断
的形状,并证明.
(
)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5685c866bc9b79e86cfba9dd4779b89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497a307dbf92cb91fb04ebcdc8f6f558.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b292a8835d2b23ecc22bc2097eeb4f.png)
您最近一年使用:0次
2018-07-01更新
|
651次组卷
|
7卷引用:2015-2016学年山东省临沂一中高二上学期期中考试理科数学试卷
2011·河北唐山·一模
名校
5 . △ABC中,角A,B,C对边的边长分别是a,b,c,且a(cosB+cosC)=b+c.
(1)求证:A
;
(2)若△ABC外接圆半径为1,求△ABC周长的取值范围.
(1)求证:A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72add9c1c236c3cd8f0be037f200798.png)
(2)若△ABC外接圆半径为1,求△ABC周长的取值范围.
您最近一年使用:0次
2016-11-30更新
|
1076次组卷
|
3卷引用:2011届河北省唐山一中高三高考仿真文数
6 . 已知函数
在区间
上单调递减,在区间
上单调递增;如图,四边形OACB中,a,b,c为△ABC的内角以B, C的对边,且满足
.
![](https://img.xkw.com/dksih/QBM/2015/8/12/1572209441406976/1572209447419904/STEM/4894bf6c709b4506931c7d9668d3773e.png)
(Ⅰ)证明:b+c =2a:
(Ⅱ)若b=c,设
.
,求四边形OACB面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb6975e15edcecfc8bf34f988e0edb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b53cbbbbb6ab479e343bc2f35bd28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c6fb2636768c5a2411be5c51c571e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75dec240abb82e1040093cfad0b7ad49.png)
![](https://img.xkw.com/dksih/QBM/2015/8/12/1572209441406976/1572209447419904/STEM/4894bf6c709b4506931c7d9668d3773e.png)
(Ⅰ)证明:b+c =2a:
(Ⅱ)若b=c,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a435595b56048676ff6fab46a37f6cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5dc4fd945129e7bf0b290e3e9113c9.png)
您最近一年使用:0次