名校
解题方法
1 . 已知
中内角
所对的边分别为
,且
,
.
(Ⅰ)求角A的大小;
(Ⅱ)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc3ba8eb26de51cc2c3e434db02d350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(Ⅰ)求角A的大小;
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9c900e2ab8cc26847ae1d34b35b6b5.png)
您最近一年使用:0次
2020-09-20更新
|
2799次组卷
|
4卷引用:浙江省台州市书生中学2020-2021学年高二上学期起始考试数学试题
解题方法
2 . 若
的内角满足
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f4f88754ccb2dbc8c441261e1a6cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
您最近一年使用:0次
2020-07-15更新
|
1909次组卷
|
2卷引用:江苏省徐州市2020届高三下学期考前模拟(四模)数学试题
名校
解题方法
3 . 已知直角三角形
的三内角
,
,
的对边分别为
,
,
,
,且不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8818e9f77db81fd520eca4dac658e71c.png)
恒成立,则实数
的最大值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/6aebec30356b590a72bc2a75f9b09221.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8818e9f77db81fd520eca4dac658e71c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966195baa48ac1a4b3ae39f312ab1bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
4 . 某同学在研究下学习中,关于三角形与三角函数知识的应用(约定三内角
,
,
的对边分别为
,
,
)得出如下一些结论:
(1)若
是钝角三角形,则
;
(2)若
是锐角三角形,则
;
(3)在三角形
中,若
,则
;
(4)在
中,若
,
,则
,
其中错误命题的个数是( )
![](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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9a198f7af53ea5631c582ece061982.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cf98c71748a0eb1b5c8cedb39ab876.png)
(3)在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d0b9c0c01b49be6e08a111568f77f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca985a8f6052c21889591f47c49622b0.png)
(4)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a2508a308155f2f16f394f8a0ba29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade5ba7a4c3354396f4c5e9501b6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523e226cff017279508f007761014f90.png)
其中错误命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
名校
解题方法
5 . 在△ABC中,内角A,B,C所对的边分别为a,b,c,已知
.
(1)求证:a,b,c成等比数列;
(2)若
求a+c的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc58e5d3f9ec18c5e8960584e7549a6.png)
(1)求证:a,b,c成等比数列;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a92830e793836a489e8e39d07189d58.png)
您最近一年使用:0次
2020-01-07更新
|
691次组卷
|
2卷引用:重庆市育才中学2014-2015学年高一下学期期中数学(文)试题
名校
解题方法
6 . 如图示,
是以
为直径的圆的下半圆弧上的一动点(异于
、
两点),
、
分别为
、
在过点
的直线
上的射影(
、
在直线
的上方),记
,
,向量
∥直线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/b51f982f-9629-4228-87d1-ab65d28dfdad.png?resizew=180)
(1)若
,求
面积
的最大值及
取得最大值时
的值;
(2)若
,用
表示向量
、
在向量
方向上的投影之和的绝对值,试问
、
满足什么条件时,
有最大值?
(3)若
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8573bdd09f4da66c67306ae060801a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55331a81e06a4e2e5db50b5da81376d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d753a0a27ec4302346bcee918ebd3e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/b51f982f-9629-4228-87d1-ab65d28dfdad.png?resizew=180)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f654198c1e01d97f1378b35d7c68ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e287cd7e75c3199af6f935492c947a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d753a0a27ec4302346bcee918ebd3e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33c17f76a76035ac9f0662b0f1398c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3f16ddd179668a1354fde7d2ad37db.png)
您最近一年使用:0次
2017-07-24更新
|
824次组卷
|
3卷引用:广东省仲元中学2016-2017学年高一下学期期中考试数学试题