名校
解题方法
1 . 十七世纪法国数学家、被誉为业余数学家之王的皮埃尔·德·费马提出的一个著名的几何问题:“已知一个三角形,求作一点,使其与这个三角形的三个顶点的距离之和最小.”它的答案是:“当三角形的三个角均小于
时,所求的点为三角形的正等角中心,即该点与三角形的三个顶点的连线两两成角
;当三角形有一内角大于或等于
时,所求点为三角形最大内角的顶点.”在费马问题中所求的点称为费马点. 试用以上知识解决下面问题:已知
的内角
所对的边分别为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ec9cff8627e76b61e6474e57d7a7ef.png)
(1)求
;
(2)若
,设点
为
的费马点,求
;
(3)设点
为
的费马点,
,求实数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.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/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ec9cff8627e76b61e6474e57d7a7ef.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ac38c5cc951497a4a37778b191bcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8f8a1e38db0e55b9b1934569b24e74.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01862dfc85d45102a1343c36cb6dfe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
名校
解题方法
2 . 在
中,内角
的对边分别为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6989b55df101ab1e9f356b5648d59d0.png)
(1)求角
;
(2)已知
,点
是边
上的两个动点(
不重合),记
.
①当
时,设
的面积为
,求
的最小值:
②三角和差化积公式是一组应用广泛的三角恒等变换式,其形式如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c495012cfbb8545f18afeca6e301f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31d2e06753be0f3a773c79ba080e2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14719ec5aeb326d543642762edda66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3912863c92f4fb689d08802d6397dc5.png)
它在工程学、绘图测量学等方面,有着广泛的应用.现记
,请利用该公式,探究是否存在实常数
和
,对于所有满足题意的
,都有
成立?若存在,求出
和
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.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/d6989b55df101ab1e9f356b5648d59d0.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274708984dba57fc8a23c58e375a588e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f68ade9c228169668792516571e28a.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734a6a1d319648bb969845a9159cdba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②三角和差化积公式是一组应用广泛的三角恒等变换式,其形式如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c495012cfbb8545f18afeca6e301f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31d2e06753be0f3a773c79ba080e2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14719ec5aeb326d543642762edda66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3912863c92f4fb689d08802d6397dc5.png)
它在工程学、绘图测量学等方面,有着广泛的应用.现记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec87f241ad67ce8b51b497766886ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faac624f25ebbba44bf8f2c4a84791cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2024-05-04更新
|
282次组卷
|
3卷引用:广东省广州市真光中学2023-2024学年高一下学期期中考试数学试卷
广东省广州市真光中学2023-2024学年高一下学期期中考试数学试卷广东省四会中学、广信中学2023-2024学年高一下学期第二次月考数学试题(已下线)专题06 解三角形综合大题归类(2) -期末考点大串讲(苏教版(2019))
3 . 变分法是研究变元函数达到极值的必要条件和充要条件,欧拉、拉格朗日等数学家为其奠定了理论基础,其中“平缓函数”是变分法中的一个重要概念.设
是定义域为
的函数,如果对任意的
均成立,则称
是“平缓函数”.
(1)若
.试判断
和
是否为“平缓函数”?并说明理由;(参考公式:①
时,
恒成立;②
.)
(2)若函数
是周期为2的“平缓函数”,证明:对定义域内任意的
,均有
;
(3)设
为定义在
上的函数,且存在正常数
,使得函数
为“平缓函数”.现定义数列
满足:
,试证明:对任意的正整数
.
(参考公式:
且
时,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0477d1ddf513166ff0fabd3ee530f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace257e3f8df8fb9d6b7cd552caaab42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1898b8d7f9852b531bab793d7ed14526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fefc229bf0f2f31967a6207ba0787a.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ebaef33ec95792488f08b953ede2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1ab2e5e3dd3a1c768a88eb182b44d9.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6bf90a1bbeea09e1b7206975a99f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b2f6fed0393ea805284e97165adfe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15b0de113b11a0ba267db5121803a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3e9e2c1543e3478ea3bca064fcf900.png)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734ac636f4a1c878bf563fdd2e8ea6d8.png)
您最近一年使用:0次
2024-04-26更新
|
403次组卷
|
3卷引用:云南省昆明市云南师范大学附属中学2023-2024学年高一下学期教学测评期中卷数学试卷
云南省昆明市云南师范大学附属中学2023-2024学年高一下学期教学测评期中卷数学试卷四川省成都市成飞中学2023-2024学年高一下学期5月月考数学试题(已下线)专题10 利用微分中值法证明不等式【讲】
名校
4 . 已知
,函数
.
(1)我们知道,向量数量积对加法的分配律,等价于向量往同一方向投影与求和可以交换次序.请借助以上后者的观点,写出
的值域.
(2)若
的最大值为
,求
的最小值.
(3)若
的最大值为1,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b9a61c77d921d8d839a5b0f0b2bd2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67e90053e85470f4ca6b49d65261086.png)
(1)我们知道,向量数量积对加法的分配律,等价于向量往同一方向投影与求和可以交换次序.请借助以上后者的观点,写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cea7aec78e82b5e87b564732c649657.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47eafbc322e14a62e2684a4a1dc1e9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3d933c0633f58a2268e692d888faf5.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c936a31eea68d7ded7c566fd9ad4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9157af5fc58b6b08ad20628871d764.png)
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名校
解题方法
5 . 已知
.其中
为常数,且
.
(1)求
;
(2)若
,
,求
;
(3)分别求
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be602468b0b4fad2667d511a041d14b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb006ea697b63a914eb487073f0abe1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a5ce0330d68c299dcc9b264ac28713.png)
(3)分别求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b04da7eac640b5b735da7fb5da8cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3884b343d76a26b4b85b48987d7064.png)
您最近一年使用:0次
名校
解题方法
6 . 对于角的集合
和角
,定义
为集合
相对角
的“余弦方差”.
(1)集合
和
相对角
的“余弦方差”分别为多少?
(2)角
,集合
,求
相对角
的“余弦方差”为多少?
(3)角
,集合
,求
相对角
的“余弦方差”是否有最大值?若有求出最大值,若没有说明理由?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94201a1fe57d13f172c3347fe2f2f0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0578330c7c71ecdf4354d855174051a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94201a1fe57d13f172c3347fe2f2f0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(1)集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1894b46e13b35c59a8868c301df8c4c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae35267fd999a81a65596312be5bf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1676b17f3641daf630f709517d22d120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e2bf1f8cf438ad7898cf463b2ab07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b18694da971f8a3bf64ca54b4d5198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740d1fc2346ac825c16515558b1af667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
名校
解题方法
7 . 令
,
,定义函数
,如果
,则称非负整数n为好整数,所有好整数的集合记作W.
(1)求
、
的值;
(2)证明:
;
(3)求出集合W.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c92cf1759acf10d2e74f6e4915158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f7a420205bbe7fb7a5707a14fd3a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d71c5943b3d883e8721a4c5bbee5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b91e45df2d12396d9dbdf8748fec07.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce6155e181e21ce56ea658b70f8af17.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5398b3972437e94931fbbc9504f80d3.png)
(3)求出集合W.
您最近一年使用:0次
解题方法
8 . 记
的内角A,B,C的对边分别为a,b,c,已知
.
(1)若
,求B;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c441662286a662cafd001968d531f8e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09eebab59213386449a726b75065bf76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e911b4c3316981231030c185079161.png)
您最近一年使用:0次
2023-01-27更新
|
4423次组卷
|
3卷引用:重难点:解三角形综合检测(提高卷)
9 . 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
|
5120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)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)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
10 . 已知
,
,且
,求
、
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eeae4e4940d654f083f1073ba872504.png)
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6卷引用:第03讲 几个三角恒等式-【帮课堂】2021-2022学年高一数学同步精品讲义(苏教版2019必修第二册)
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