名校
1 . 在
中,角
所对的边分别为
,且
.
(1)证明:
成等比数列;
(2)若
,且
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/cf081a66e757ea45194c0dee161dbb33.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4a8c2c7845cfb1b094d13e66e0ed87.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d08a8e10d6ff1fd3d91fe4d4ed31352d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
2018-12-10更新
|
597次组卷
|
3卷引用:【市级联考】湖北省鄂州市2019届高三上学期期中考试数学(文)试题
2 . 在
中,角
所对的边分别为
,且
.
(1)证明:
成等比数列;
(2)若
,且
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/cf081a66e757ea45194c0dee161dbb33.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4a8c2c7845cfb1b094d13e66e0ed87.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787dcfe056d2f542bbb3df2c87d6c335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
2018-11-30更新
|
709次组卷
|
5卷引用:湖北省鄂州市2019届高三上学期期中考试数学(理)试卷
11-12高一下·湖南衡阳·期中
名校
解题方法
3 . 设在平面上有两个向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c3157804841c33ba04395fe84c6b18.png)
,
,
与
不共线.
(1)求证:向量
与
垂直;
(2)当向量
与
的模相等时,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c3157804841c33ba04395fe84c6b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850146e508c3cde676fe67e973a8346b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af657bdd9885b366cdebbd1f5484a293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
(1)求证:向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b98386771bbcbdb72732c37633dff29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713eb2a72f8f690b71f27ec93ff40a34.png)
(2)当向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5be83efa9dc7c7055e8b5a43fa368b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9342d490730fc4e2130aa46aee059ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2017-10-13更新
|
835次组卷
|
6卷引用:湖北省十堰市丹江口市第一中学2021-2022学年高一下学期期中数学试题(二)
11-12高三下·上海·开学考试
名校
4 . 已知
中,三个内角
、
、
的对边分别是
、
、
,其中
,且
.
(1)求证:
是直角三角形;
(2)设圆
过
、
、
三点,点
位于劣弧上
,
.求四边形
的面积.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d39e8c6fc9149d6290c493a65bdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa171ccbdd48673be1713e67fb130e7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)设圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e12bfde565540f059dd27ea47dfaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027ed57b9c6f24e27ec0ae282c76efa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/65ed77cf-6ea3-4443-83da-cd615194c0f9.png?resizew=206)
您最近一年使用:0次
2017-04-21更新
|
423次组卷
|
3卷引用:2016-2017学年湖北省重点高中联考协作体高一下学期期中考试数学试卷
2012·河北衡水·一模
5 . 根据两角和与差的正弦公式,有:
sin(α+β)=sinαcosβ+cosαsinβ①
sin(α–β)=sinαcosβ–cosαsinβ②
由①+②得,sin(α+β)+sin(α–β)=2sinαcosβ③
令α+β=A,α–β=B,则
,代入③得:
.
(1)类比上述推理方法,根据两角的和差的余弦公式,求证:
;
(2)若△ABC的三个内角A、B、C满足cos2A–cos2B=1–cos2C,试判断△ABC的形状.
sin(α+β)=sinαcosβ+cosαsinβ①
sin(α–β)=sinαcosβ–cosαsinβ②
由①+②得,sin(α+β)+sin(α–β)=2sinαcosβ③
令α+β=A,α–β=B,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfbef54b4bf83a9e155e807a7adb8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37ad09748c2437f90ca23196f611bd0.png)
(1)类比上述推理方法,根据两角的和差的余弦公式,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50382bd07c264a4ea9d01f1aab30a99a.png)
(2)若△ABC的三个内角A、B、C满足cos2A–cos2B=1–cos2C,试判断△ABC的形状.
您最近一年使用:0次
2016-12-02更新
|
911次组卷
|
8卷引用:2015-2016学年湖北省襄阳市四校高一下学期期中联考数学试卷
2015-2016学年湖北省襄阳市四校高一下学期期中联考数学试卷(已下线)2011-2012学年江苏姜堰市张甸中学高二第二学期期中理科数学试卷(已下线)2012-2013学年福建省南安一中高二下学期期中考试文科数学试卷(已下线)2012届河北省衡水中学高三第一次模拟考试理科数学试卷 (已下线)2012届河北省衡水中学高三第一次模拟考试文科数学试卷(已下线)2012届山西省山大附中高三第一次模拟试题理科数学试卷福建省闽侯第四中学2017-2018学年高一上学期期末考试数学试题(已下线)2019年6月29日《每日一题》必修3+必修4(下学期期末复习)—— 周末培优