22-23高三·河北·阶段练习
名校
解题方法
1 . 在锐角
中,
均为已知常数),.
的外接圆,内切圆半径分别为
.
(1)求
;
(2)点
分别在线段
上,
的周长为
,请证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b39ec72f31e276913731fe528ea501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4c5cf91626c9466cb419c9f05b635e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc856c1ae94972c6699b3952f92c72.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee14312eec42c729aab9880e09d3726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f50605db5d5f8f3a01ee8e474a112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddf27f1db96592cdf0eef5d9481a759.png)
您最近一年使用:0次
2023-02-06更新
|
1100次组卷
|
3卷引用:重难点:解三角形综合检测(提高卷)
2 . 设锐角三角形ABC的内角A、B、C所对的边分别为a、b、c,已知
.
(1)求证:B=2A;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6194c583037bd04e32fbf9b435084a9d.png)
(1)求证:B=2A;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd950ec83d93596468e3aff0bb91e0e9.png)
您最近一年使用:0次
2022-12-29更新
|
5125次组卷
|
7卷引用:第11章《解三角形》单元达标高分突破必刷卷(培优版)
第11章《解三角形》单元达标高分突破必刷卷(培优版)广东省汕头市2023届高三上学期期末数学试题(已下线)专题4 三角函数与解三角形 第2讲三角恒等变换与解三角形安徽省阜阳市第四中学2023届高三下学期第一次月考数学试题陕西省渭南市韩城市象山中学2022-2023学年高一下学期期中数学试题(已下线)高一下学期期中复习解答题压轴题十八大题型专练(1)-举一反三系列(人教A版2019必修第二册)(已下线)专题02 高一下期末真题精选(1)-期末考点大串讲(人教A版2019必修第二册)
解题方法
3 . 如图所示,在四边形
中,
,
,
,
,
,点
为四边形
的外接圆劣弧
(不含端点
,
)上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/77dc3669-b556-4f5a-bfd4-5d7e44723f9e.png?resizew=142)
(Ⅰ)判断
的形状,并证明;
(Ⅱ)若
,设
,
,求函数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954d2fd2aecd31ff67d975bc8981023a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f028b10ae7e2a83316c077cdccd6ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/77dc3669-b556-4f5a-bfd4-5d7e44723f9e.png?resizew=142)
(Ⅰ)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272c5e2a28daff5a36abd64267fcaa5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a9ab5a9114daaa0fd3f6c5f1885f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038bd8c95ff3649e957b67036207fbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794f2c6bd63355105d179d11306a9cae.png)
您最近一年使用:0次
4 . 在△ABC中,a,b,c分别为内角A,B,C所对边的边长,且C=
,a+b=λc(其中λ>1).
(1)若λ=
时,证明:△ABC为直角三角形;
(2)若
·
=
λ2,且c=3,求λ的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
(1)若λ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436b63e793d6d39990341d29cf47f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b62ea9f2ffb1342d9edc22e9649cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
您最近一年使用:0次
2018-10-05更新
|
1328次组卷
|
2卷引用:2018-2019学年人教A版高中数学必修5第一章解三角形单元综合测试题
真题
5 . 在
ABC中,内角
所对的边分别为a,b,c.已知b+c=2acos B.
(Ⅰ)证明:A=2B;
(Ⅱ)若cos B=
,求cos C的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378a2df371f5ff1815c03a84f571229.png)
(Ⅰ)证明:A=2B;
(Ⅱ)若cos B=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
您最近一年使用:0次
2016-12-04更新
|
4649次组卷
|
5卷引用:第1章 章末检测-2018-2019版数学创新设计课堂讲义同步系列(苏教版必修5)
(已下线)第1章 章末检测-2018-2019版数学创新设计课堂讲义同步系列(苏教版必修5)2016年全国普通高等学校招生统一考试文科数学(浙江卷精编版)(已下线)2016年全国普通高等学校招生统一考试文科数学(浙江卷参考版)(已下线)专题20 三角函数及解三角形解答题(文科)-1专题30三角函数与解三角形解答题